BUSYBOX(1)

NAME
BusyBox - The Swiss Army Knife of Embedded Linux

SYNTAX
 busybox <applet> [arguments...]  # or

 <applet> [arguments...]            # if symlinked

DESCRIPTION
BusyBox combines tiny versions of many common UNIX utilities into a single small executable. It provides minimalist replacements for most of the utilities you usually find in GNU coreutils, util-linux, etc. The utilities in BusyBox generally have fewer options than their full-featured GNU cousins; however, the options that are included provide the expected functionality and behave very much like their GNU counterparts.

BusyBox has been written with size-optimization and limited resources in mind. It is also extremely modular so you can easily include or exclude commands (or features) at compile time. This makes it easy to customize your embedded systems. To create a working system, just add /dev, /etc, and a Linux kernel. BusyBox provides a fairly complete POSIX environment for any small or embedded system.

BusyBox is extremely configurable. This allows you to include only the components you need, thereby reducing binary size. Run 'make config' or 'make menuconfig' to select the functionality that you wish to enable. Then run 'make' to compile BusyBox using your configuration.

After the compile has finished, you should use 'make install' to install BusyBox. This will install the 'bin/busybox' binary, in the target directory specified by CONFIG_PREFIX. CONFIG_PREFIX can be set when configuring BusyBox, or you can specify an alternative location at install time (i.e., with a command line like 'make CONFIG_PREFIX=/tmp/foo install'). If you enabled any applet installation scheme (either as symlinks or hardlinks), these will also be installed in the location pointed to by CONFIG_PREFIX.

USAGE
BusyBox is a multi-call binary. A multi-call binary is an executable program that performs the same job as more than one utility program. That means there is just a single BusyBox binary, but that single binary acts like a large number of utilities. This allows BusyBox to be smaller since all the built-in utility programs (we call them applets) can share code for many common operations.

You can also invoke BusyBox by issuing a command as an argument on the command line. For example, entering

        /bin/busybox ls

will also cause BusyBox to behave as 'ls'.

Of course, adding '/bin/busybox' into every command would be painful. So most people will invoke BusyBox using links to the BusyBox binary.

For example, entering

        ln -s /bin/busybox ls
        ./ls

will cause BusyBox to behave as 'ls' (if the 'ls' command has been compiled into BusyBox). Generally speaking, you should never need to make all these links yourself, as the BusyBox build system will do this for you when you run the 'make install' command.

If you invoke BusyBox with no arguments, it will provide you with a list of the applets that have been compiled into your BusyBox binary.

COMMON OPTIONS
Most BusyBox applets support the --help argument to provide a terse runtime description of their behavior. If the CONFIG_FEATURE_VERBOSE_USAGE option has been enabled, more detailed usage information will also be available.

COMMANDS
Currently available applets include:

        [, [[, acpid, addgroup, adduser, adjtimex, ar, arp, arping, ash,
        awk, basename, bbconfig, bbsh, blkid, brctl, bunzip2, busybox,
        bzcat, bzip2, cal, cat, catv, chat, chattr, chcon, chgrp, chmod,
        chown, chpasswd, chpst, chroot, chrt, chvt, cksum, clear, cmp,
        comm, cp, cpio, crond, crontab, cryptpw, cttyhack, cut, date, dc,
        dd, deallocvt, delgroup, deluser, depmod, devfsd, devmem, df,
        dhcprelay, diff, dirname, dmesg, dnsd, dos2unix, dpkg, dpkg_deb,
        du, dumpkmap, dumpleases, e2fsck, echo, ed, egrep, eject, env,
        envdir, envuidgid, ether_wake, expand, expr, fakeidentd, false,
        fbset, fbsplash, fdflush, fdformat, fdisk, fgrep, find, findfs,
        flash_eraseall, fold, free, freeramdisk, fsck, fsck_minix, ftpd,
        ftpget, ftpput, fuser, getenforce, getopt, getsebool, getty,
        grep, gunzip, gzip, halt, hd, hdparm, head, hexdump, hostid,
        hostname, httpd, hush, hwclock, id, ifconfig, ifdown, ifenslave,
        ifup, inetd, init, inotifyd, insmod, install, ionice, ip, ipaddr,
        ipcalc, ipcrm, ipcs, iplink, iproute, iprule, iptunnel, kbd_mode,
        kill, killall, killall5, klogd, lash, last, length, less,
        linux32, linux64, linuxrc, ln, load_policy, loadfont, loadkmap,
        logger, login, logname, logread, losetup, lpd, lpq, lpr, ls,
        lsattr, lsmod, lzmacat, makedevs, makemime, man, matchpathcon,
        md5sum, mdev, mesg, microcom, mkdir, mke2fs, mkfifo, mkfs_minix,
        mkfs_vfat, mknod, mkpasswd, mkswap, mktemp, modprobe, more,
        mount, mountpoint, msh, mt, mv, nameif, nc, netstat, nice,
        nmeter, nohup, nslookup, od, openvt, parse, passwd, patch, pgrep,
        pidof, ping, ping6, pipe_progress, pivot_root, pkill, popmaildir,
        poweroff, printenv, printf, ps, pscan, pwd, raidautorun, rdate,
        rdev, readahead, readlink, readprofile, realpath, reboot,
        reformime, renice, reset, resize, restorecon, rm, rmdir, rmmod,
        route, rpm, rpm2cpio, rtcwake, run_parts, runcon, runlevel,
        runsv, runsvdir, rx, script, sed, selinuxenabled, sendmail, seq,
        sestatus, setarch, setconsole, setenforce, setfiles, setfont,
        setkeycodes, setlogcons, setsebool, setsid, setuidgid, sh,
        sha1sum, sha256sum, sha512sum, showkey, slattach, sleep,
        softlimit, sort, split, start_stop_daemon, stat, strings, stty,
        su, sulogin, sum, sv, svlogd, swapoff, swapon, switch_root, sync,
        sysctl, syslogd, tac, tail, tar, taskset, tc, tcpsvd, tee,
        telnet, telnetd, test, tftp, tftpd, time, timeout, top, touch,
        tr, traceroute, true, tty, ttysize, tunctl, tune2fs, udhcpc,
        udhcpd, udpsvd, umount, uname, uncompress, unexpand, uniq,
        unix2dos, unlzma, unzip, uptime, usleep, uudecode, uuencode,
        vconfig, vi, vlock, watch, watchdog, wc, wget, which, who,
        whoami, xargs, yes, zcat, zcip

COMMAND DESCRIPTIONS

acpid
    acpid [-d] [-c CONFDIR] [-l LOGFILE] [-e PROC_EVENT_FILE] [EVDEV_EVENT_FILE...]

    Listen to ACPI events and spawn specific helpers on event arrival

    Options:

            -d      Do not daemonize and log to stderr
            -c DIR  Config directory [/etc/acpi]
            -e FILE /proc event file [/proc/acpi/event]
            -l FILE Log file [/var/log/acpid]

    Accept and ignore compatibility options -g -m -s -S -v

    Example:

            # acpid -l /var/log/my-acpi-log
            # acpid -d /dev/input/event*

addgroup
    addgroup [-g GID] [user_name] group_name

    Add a group or add a user to a group

    Options:

            -g GID  Group id

adduser
    adduser [OPTIONS] user_name

    Add a user

    Options:

            -h DIR          Home directory
            -g GECOS        GECOS field
            -s SHELL        Login shell
            -G GROUP        Add user to existing group
            -S              Create a system user
            -D              Do not assign a password
            -H              Do not create home directory

adjtimex
    adjtimex [-q] [-o offset] [-f frequency] [-p timeconstant] [-t tick]

    Read and optionally set system timebase parameters. See adjtimex(2).

    Options:

            -q              Quiet
            -o offset       Time offset, microseconds
            -f frequency    Frequency adjust, integer kernel units (65536 is 1ppm)
                            (positive values make clock run faster)
            -t tick         Microseconds per tick, usually 10000
            -p timeconstant

ar  ar [-o] [-v] [-p] [-t] [-x] ARCHIVE FILES

    Extract or list FILES from an ar archive

    Options:

            -o      Preserve original dates
            -p      Extract to stdout
            -t      List
            -x      Extract
            -v      Verbose

arp arp
    [-vn]    [-H type] [-i if] -a [hostname]
    [-v]      [-i if] -d hostname [pub]
    [-v]    [-H type] [-i if] -s hostname hw_addr [temp]
    [-v]    [-H type] [-i if] -s hostname hw_addr [netmask nm] pub
    [-v]    [-H type] [-i if] -Ds hostname ifa [netmask nm] pub

    Manipulate ARP cache

    Options:

            -a              Display (all) hosts
            -s              Set new ARP entry
            -d              Delete a specified entry
            -v              Verbose
            -n              Don't resolve names
            -i IF           Network interface
            -D              Read <hwaddr> from given device
            -A, -p AF       Protocol family
            -H HWTYPE       Hardware address type

arping
    arping [-fqbDUA] [-c count] [-w timeout] [-I dev] [-s sender] target

    Send ARP requests/replies

    Options:

            -f              Quit on first ARP reply
            -q              Quiet
            -b              Keep broadcasting, don't go unicast
            -D              Duplicated address detection mode
            -U              Unsolicited ARP mode, update your neighbors
            -A              ARP answer mode, update your neighbors
            -c N            Stop after sending N ARP requests
            -w timeout      Time to wait for ARP reply, in seconds
            -I dev          Interface to use (default eth0)
            -s sender       Sender IP address
            target          Target IP address

ash ash #define ash_full_usage

awk awk [OPTION]... [program-text] [FILE...]

    Options:

            -v var=val      Set variable
            -F sep          Use sep as field separator
            -f file         Read program from file

basename
    basename FILE [SUFFIX]

    Strip directory path and suffixes from FILE. If specified, also remove any trailing SUFFIX.

    Example:

            $ basename /usr/local/bin/foo
            foo
            $ basename /usr/local/bin/
            bin
            $ basename /foo/bar.txt .txt
            bar

bbconfig
    bbconfig

    Print the config file which built busybox

bbsh
    bbsh [FILE]... or: bbsh -c command [args]...

    The bbsh shell (command interpreter)

blkid
    blkid

    Print UUIDs of all filesystems.

brctl
    brctl COMMAND [BRIDGE [INTERFACE]]

    Manage ethernet bridges.

    Commands:

            show                    Show a list of bridges
            addbr BRIDGE            Create BRIDGE
            delbr BRIDGE            Delete BRIDGE
            addif BRIDGE IFACE      Add IFACE to BRIDGE
            delif BRIDGE IFACE      Delete IFACE from BRIDGE
            setageing BRIDGE TIME           Set ageing time
            setfd BRIDGE TIME               Set bridge forward delay
            sethello BRIDGE TIME            Set hello time
            setmaxage BRIDGE TIME           Set max message age
            setpathcost BRIDGE COST         Set path cost
            setportprio BRIDGE PRIO         Set port priority
            setbridgeprio BRIDGE PRIO       Set bridge priority
            stp BRIDGE [1|0]                STP on/off

bunzip2
    bunzip2 [OPTION]... [FILE]

    Uncompress FILE (or standard input if FILE is '-' or omitted)

    Options:

            -c      Write to standard output
            -f      Force

busybox
    busybox

    Hello world!

bzcat
    bzcat FILE

    Uncompress to stdout

bzip2
    bzip2 [OPTION]... [FILE]...

    Compress FILE(s) with bzip2 algorithm. When FILE is '-' or unspecified, reads standard input. Implies -c.

    Options:

            -c      Write to standard output
            -d      Decompress
            -f      Force
            -1..-9  Compression level

cal cal [-jy] [[month] year]

    Display a calendar

    Options:

            -j      Use julian dates
            -y      Display the entire year

cat cat [-u] [FILE]...

    Concatenate FILE(s) and print them to stdout

    Options:

            -u      Use unbuffered i/o (ignored)

    Example:

            $ cat /proc/uptime
            110716.72 17.67

catv
    catv [-etv] [FILE]...

    Display nonprinting characters as ^x or M-x

    Options:

            -e      End each line with $
            -t      Show tabs as ^I
            -v      Don't use ^x or M-x escapes

chat
    chat EXPECT [SEND [EXPECT [SEND...]]]

    Useful for interacting with a modem connected to stdin/stdout. A script consists of one or more "expect-send" pairs of strings, each pair is a pair of arguments. Example: chat '' ATZ OK ATD123456 CONNECT '' ogin: pppuser word: ppppass '~'

chattr
    chattr [-R] [-+=AacDdijsStTu] [-v version] files...

    Change file attributes on an ext2 fs

    Modifiers:

            -       Remove attributes
            +       Add attributes
            =       Set attributes
    Attributes:

            A       Don't track atime
            a       Append mode only
            c       Enable compress
            D       Write dir contents synchronously
            d       Do not backup with dump
            i       Cannot be modified (immutable)
            j       Write all data to journal first
            s       Zero disk storage when deleted
            S       Write file contents synchronously
            t       Disable tail-merging of partial blocks with other files
            u       Allow file to be undeleted
    Options:

            -R      Recursively list subdirectories
            -v      Set the file's version/generation number

chcon
    chcon [OPTIONS] CONTEXT FILE...
        chcon [OPTIONS] [-u USER] [-r ROLE] [-l RANGE] [-t TYPE] FILE...
        chcon [OPTIONS] --reference=RFILE FILE...

    Change the security context of each FILE to CONTEXT

            -v,--verbose            Verbose
            -c,--changes            Report changes made
            -h,--no-dereference     Affect symlinks instead of their targets
            -f,--silent,--quiet     Suppress most error messages
            --reference=RFILE       Use RFILE's group instead of using a CONTEXT value
            -u,--user=USER          Set user/role/type/range in the target
            -r,--role=ROLE          security context
            -t,--type=TYPE
            -l,--range=RANGE
            -R,--recursive          Recurse subdirectories

chgrp
    chgrp [-RhLHPcvf]... GROUP FILE...

    Change the group membership of each FILE to GROUP

    Options:

            -R      Recurse directories
            -h      Affect symlinks instead of symlink targets
            -L      Traverse all symlinks to directories
            -H      Traverse symlinks on command line only
            -P      Do not traverse symlinks (default)
            -c      List changed files
            -v      Verbose
            -f      Hide errors

    Example:

            $ ls -l /tmp/foo
            -r--r--r--    1 andersen andersen        0 Apr 12 18:25 /tmp/foo
            $ chgrp root /tmp/foo
            $ ls -l /tmp/foo
            -r--r--r--    1 andersen root            0 Apr 12 18:25 /tmp/foo

chmod
    chmod [-Rcvf] MODE[,MODE]... FILE...

    Each MODE is one or more of the letters ugoa, one of the symbols +-= and one or more of the letters rwxst

    Options:

            -R      Recurse directories
            -c      List changed files
            -v      List all files
            -f      Hide errors

    Example:

            $ ls -l /tmp/foo
            -rw-rw-r--    1 root     root            0 Apr 12 18:25 /tmp/foo
            $ chmod u+x /tmp/foo
            $ ls -l /tmp/foo
            -rwxrw-r--    1 root     root            0 Apr 12 18:25 /tmp/foo*
            $ chmod 444 /tmp/foo
            $ ls -l /tmp/foo
            -r--r--r--    1 root     root            0 Apr 12 18:25 /tmp/foo

chown
    chown [-RhLHPcvf]... OWNER[<.|:>[GROUP]] FILE...

    Change the owner and/or group of each FILE to OWNER and/or GROUP

    Options:

            -R      Recurse directories
            -h      Affect symlinks instead of symlink targets
            -L      Traverse all symlinks to directories
            -H      Traverse symlinks on command line only
            -P      Do not traverse symlinks (default)
            -c      List changed files
            -v      List all files
            -f      Hide errors

    Example:

            $ ls -l /tmp/foo
            -r--r--r--    1 andersen andersen        0 Apr 12 18:25 /tmp/foo
            $ chown root /tmp/foo
            $ ls -l /tmp/foo
            -r--r--r--    1 root     andersen        0 Apr 12 18:25 /tmp/foo
            $ chown root.root /tmp/foo
            ls -l /tmp/foo
            -r--r--r--    1 root     root            0 Apr 12 18:25 /tmp/foo

chpasswd
    chpasswd [--md5|--encrypted]

    Read user:password information from stdin and update /etc/passwd accordingly.

    Options:

            -e,--encrypted  Supplied passwords are in encrypted form
            -m,--md5        Use MD5 encryption instead of DES

chpst
    chpst [-vP012] [-u USER[:GRP]] [-U USER[:GRP]] [-e DIR]
        [-/ DIR] [-n NICE] [-m BYTES] [-d BYTES] [-o N]
        [-p N] [-f BYTES] [-c BYTES] PROG ARGS

    Change the process state and run PROG

    Options:

            -u USER[:GRP]   Set uid and gid
            -U USER[:GRP]   Set $UID and $GID in environment
            -e DIR          Set environment variables as specified by files
                            in DIR: file=1st_line_of_file
            -/ DIR          Chroot to DIR
            -n NICE         Add NICE to nice value
            -m BYTES        Same as -d BYTES -s BYTES -l BYTES
            -d BYTES        Limit data segment
            -o N            Limit number of open files per process
            -p N            Limit number of processes per uid
            -f BYTES        Limit output file sizes
            -c BYTES        Limit core file size
            -v              Verbose
            -P              Create new process group
            -0              Close standard input
            -1              Close standard output
            -2              Close standard error

chroot
    chroot NEWROOT [COMMAND...]

    Run COMMAND with root directory set to NEWROOT

    Example:

            $ ls -l /bin/ls
            lrwxrwxrwx    1 root     root          12 Apr 13 00:46 /bin/ls -> /BusyBox
            # mount /dev/hdc1 /mnt -t minix
            # chroot /mnt
            # ls -l /bin/ls
            -rwxr-xr-x    1 root     root        40816 Feb  5 07:45 /bin/ls*

chrt
    chrt [OPTION]... [prio] [pid | command [arg]...]

    Manipulate real-time attributes of a process

    Options:

            -p      Operate on pid
            -r      Set scheduling policy to SCHED_RR
            -f      Set scheduling policy to SCHED_FIFO
            -o      Set scheduling policy to SCHED_OTHER
            -m      Show min and max priorities

    Example:

            $ chrt -r 4 sleep 900; x=$!
            $ chrt -f -p 3 $x
            You need CAP_SYS_NICE privileges to set scheduling attributes of a process

chvt
    chvt N

    Change the foreground virtual terminal to /dev/ttyN

cksum
    cksum FILES...

    Calculate the CRC32 checksums of FILES

clear
    clear

    Clear screen

cmp cmp [-l] [-s] FILE1 [FILE2 [SKIP1 [SKIP2]]]

    Compares FILE1 vs stdin if FILE2 is not specified

    Options:

            -l      Write the byte numbers (decimal) and values (octal)
                    for all differing bytes
            -s      Quiet

comm
    comm [-123] FILE1 FILE2

    Compare FILE1 to FILE2, or to stdin if - is specified

    Options:

            -1      Suppress lines unique to FILE1
            -2      Suppress lines unique to FILE2
            -3      Suppress lines common to both files

cp  cp [OPTION]... SOURCE DEST

    Copy SOURCE to DEST, or multiple SOURCE(s) to DIRECTORY

    Options:

            -a      Same as -dpR
            -c      Preserve security context
            -d,-P   Preserve links
            -H,-L   Dereference all symlinks (default)
            -p      Preserve file attributes if possible
            -f      Force overwrite
            -i      Prompt before overwrite
            -R,-r   Recurse directories
            -l,-s   Create (sym)links

cpio
    cpio -[tiopdmvu] [-F FILE] [-H newc]

    Extract or list files from a cpio archive, or create a cpio archive Main operation mode:

            -t      List
            -i      Extract
            -o      Create
            -p      Passthrough
    Options:

            -d      Make leading directories
            -m      Preserve mtime
            -v      Verbose
            -u      Overwrite
            -F      Input file
            -H      Define format

crond
    crond -fbS -l N -d N -L LOGFILE -c DIR

            -f      Foreground
            -b      Background (default)
            -S      Log to syslog (default)
            -l      Set log level. 0 is the most verbose, default 8
            -d      Set log level, log to stderr
            -L      Log to file
            -c      Working dir

crontab
    crontab [-c DIR] [-u USER] [-ler]|[FILE]

            -c      Crontab directory
            -u      User
            -l      List crontab
            -e      Edit crontab
            -r      Delete crontab
            FILE    Replace crontab by FILE ('-': stdin)

cryptpw
    cryptpw [OPTIONS] [PASSWORD] [SALT]

    Crypt the PASSWORD using crypt(3)

    Options:

            -P,--password-fd=NUM    Read password from fd NUM/*   "
            -s,--stdin              Use stdin; like -P0" */
            -m,--method=TYPE        Encryption method TYPE
            -S,--salt=SALT

cttyhack
    cttyhack #define cttyhack_full_usage

cut cut [OPTION]... [FILE]...

    Print selected fields from each input FILE to standard output

    Options:

            -b LIST Output only bytes from LIST
            -c LIST Output only characters from LIST
            -d CHAR Use CHAR instead of tab as the field delimiter
            -s      Output only the lines containing delimiter
            -f N    Print only these fields
            -n      Ignored

    Example:

            $ echo "Hello world" | cut -f 1 -d ' '
            Hello
            $ echo "Hello world" | cut -f 2 -d ' '
            world

date
    date [OPTION]... [+FMT] [TIME]

    Display time (using +FMT), or set time

    Options:

            -u              Work in UTC (don't convert to local time)
            -R              Output RFC-822 compliant date string
            -I[SPEC]        Output ISO-8601 compliant date string
                            SPEC='date' (default) for date only,
                            'hours', 'minutes', or 'seconds' for date and
                            time to the indicated precision
            -d TIME         Display TIME, not 'now'
            -r FILE         Display last modification time of FILE
            [-s] TIME       Set time to TIME
            -D FMT          Use FMT for str->date conversion

    Recognized formats for TIME:

            hh:mm[:ss]
            [YYYY.]MM.DD-hh:mm[:ss]
            YYYY-MM-DD hh:mm[:ss]
            MMDDhhmm[[YY]YY][.ss]

    Example:

            $ date
            Wed Apr 12 18:52:41 MDT 2000

dc  dc expression...

    Tiny RPN calculator. Operations: +, add, -, sub, *, mul, /, div, %, mod, **, exp, and, or, not, eor, p - print top of the stack (without altering the stack), f - print entire stack, o - pop the value and set output radix (value must be 10 or 16). Examples: 'dc 2 2 add' -> 4, 'dc 8 8 * 2 2 + /' -> 16.

    Example:

            $ dc 2 2 + p
            4
            $ dc 8 8 \* 2 2 + / p
            16
            $ dc 0 1 and p
            0
            $ dc 0 1 or p
            1
            $ echo 72 9 div 8 mul p | dc
            64

dd  dd [if=FILE] [of=FILE] [ibs=N] [obs=N] [bs=N] [count=N] [skip=N]
        [seek=N] [conv=notrunc|noerror|sync|fsync]

    Copy a file with converting and formatting

    Options:

            if=FILE         Read from FILE instead of stdin
            of=FILE         Write to FILE instead of stdout
            bs=N            Read and write N bytes at a time
            ibs=N           Read N bytes at a time
            obs=N           Write N bytes at a time
            count=N         Copy only N input blocks
            skip=N          Skip N input blocks
            seek=N          Skip N output blocks
            conv=notrunc    Don't truncate output file
            conv=noerror    Continue after read errors
            conv=sync       Pad blocks with zeros
            conv=fsync      Physically write data out before finishing

    Numbers may be suffixed by c (x1), w (x2), b (x512), kD (x1000), k (x1024), MD (x1000000), M (x1048576), GD (x1000000000) or G (x1073741824)

    Example:

            $ dd if=/dev/zero of=/dev/ram1 bs=1M count=4
            4+0 records in
            4+0 records out

deallocvt
    deallocvt [N]

    Deallocate unused virtual terminal /dev/ttyN

delgroup
    delgroup [USER] GROUP

    Delete group GROUP from the system or user USER from group GROUP

deluser
    deluser USER

    Delete USER from the system

depmod
    depmod #define depmod_full_usage

devfsd
    devfsd mntpnt [-v][-fg][-np]

    Manage devfs permissions and old device name symlinks

    Options:

            mntpnt  The mount point where devfs is mounted
            -v      Print the protocol version numbers for devfsd
                    and the kernel-side protocol version and exit
            -fg     Run in foreground
            -np     Exit after parsing the configuration file
                    and processing synthetic REGISTER events,
                    do not poll for events

devmem
    devmem ADDRESS [WIDTH [VALUE]]

    Read/write from physical address

            ADDRESS Address to act upon
            WIDTH   Width (8/16/...)
            VALUE   Data to be written

df  df [-Pkmhai] [-B SIZE] [FILESYSTEM...]

    Print filesystem usage statistics

    Options:

            -P      POSIX output format
            -k      1024-byte blocks (default)
            -m      1M-byte blocks
            -h      Human readable (e.g. 1K 243M 2G)
            -a      Show all filesystems
            -i      Inodes
            -B SIZE Blocksize

    Example:

            $ df
            Filesystem           1K-blocks      Used Available Use% Mounted on
            /dev/sda3              8690864   8553540    137324  98% /
            /dev/sda1                64216     36364     27852  57% /boot
            $ df /dev/sda3
            Filesystem           1K-blocks      Used Available Use% Mounted on
            /dev/sda3              8690864   8553540    137324  98% /
            $ POSIXLY_CORRECT=sure df /dev/sda3
            Filesystem         512B-blocks      Used Available Use% Mounted on
            /dev/sda3             17381728  17107080    274648  98% /
            $ POSIXLY_CORRECT=yep df -P /dev/sda3
            Filesystem          512-blocks      Used Available Capacity Mounted on
            /dev/sda3             17381728  17107080    274648      98% /

dhcprelay
    dhcprelay CLIENT_IFACE[,CLIENT_IFACE2...] SERVER_IFACE [SERVER_IP]

    Relay DHCP requests between clients and server

diff
    diff [-abdiNqrTstw] [-L LABEL] [-S FILE] [-U LINES] FILE1 FILE2

    Compare files line by line and output the differences between them. This implementation supports unified diffs only.

    Options:

            -a      Treat all files as text
            -b      Ignore changes in the amount of whitespace
            -d      Try hard to find a smaller set of changes
            -i      Ignore case differences
            -L      Use LABEL instead of the filename in the unified header
            -N      Treat absent files as empty
            -q      Output only whether files differ
            -r      Recursively compare subdirectories
            -S      Start with FILE when comparing directories
            -T      Make tabs line up by prefixing a tab when necessary
            -s      Report when two files are the same
            -t      Expand tabs to spaces in output
            -U      Output LINES lines of context
            -w      Ignore all whitespace

dirname
    dirname FILENAME

    Strip non-directory suffix from FILENAME

    Example:

            $ dirname /tmp/foo
            /tmp
            $ dirname /tmp/foo/
            /tmp

dmesg
    dmesg [-c] [-n LEVEL] [-s SIZE]

    Print or control the kernel ring buffer

    Options:

            -c              Clear ring buffer after printing
            -n LEVEL        Set console logging level
            -s SIZE         Buffer size

dnsd
    dnsd [-c config] [-t seconds] [-p port] [-i iface-ip] [-d]

    Small static DNS server daemon

    Options:

            -c      Config filename
            -t      TTL in seconds
            -p      Listening port
            -i      Listening ip (default all)
            -d      Daemonize

dos2unix
    dos2unix [option] [FILE]

    Convert FILE from dos to unix format. When no file is given, use stdin/stdout.

    Options:

            -u      dos2unix
            -d      unix2dos

dpkg
    dpkg [-ilCPru] [-F option] package_name

    Install, remove and manage Debian packages

    Options:

            -i              Install the package
            -l              List of installed packages
            -C              Configure an unpackaged package
            -F depends      Ignore dependency problems
            -P              Purge all files of a package
            -r              Remove all but the configuration files for a package
            -u              Unpack a package, but don't configure it

dpkg-deb
    dpkg-deb [-cefxX] FILE [argument]

    Perform actions on Debian packages (.debs)

    Options:

            -c      List contents of filesystem tree
            -e      Extract control files to [argument] directory
            -f      Display control field name starting with [argument]
            -x      Extract packages filesystem tree to directory
            -X      Verbose extract

    Example:

            $ dpkg-deb -X ./busybox_0.48-1_i386.deb /tmp

du  du [-aHLdclsxhmk] [FILE]...

    Summarize disk space used for each FILE and/or directory. Disk space is printed in units of 1024 bytes.

    Options:

            -a      Show file sizes too
            -H      Follow symlinks on command line
            -L      Follow all symlinks
            -d N    Limit output to directories (and files with -a) of depth < N
            -c      Show grand total
            -l      Count sizes many times if hard linked
            -s      Display only a total for each argument
            -x      Skip directories on different filesystems
            -h      Sizes in human readable format (e.g., 1K 243M 2G )
            -m      Sizes in megabytes
            -k      Sizes in kilobytes (default)

    Example:

            $ du
            16      ./CVS
            12      ./kernel-patches/CVS
            80      ./kernel-patches
            12      ./tests/CVS
            36      ./tests
            12      ./scripts/CVS
            16      ./scripts
            12      ./docs/CVS
            104     ./docs
            2417    .

dumpkmap
    dumpkmap > keymap

    Print a binary keyboard translation table to standard output

    Example:

            $ dumpkmap > keymap

dumpleases
    dumpleases [-r|-a] [-f LEASEFILE]

    Display DHCP leases granted by udhcpd

    Options:

            -f,--file=FILE  Leases file to load
            -r,--remaining  Interpret lease times as time remaining
            -a,--absolute   Interpret lease times as expire time

e2fsck
    e2fsck [-panyrcdfvstDFSV] [-b superblock] [-B blocksize] [-I inode_buffer_blocks] [-P process_inode_size] [-l|-L bad_blocks_file] [-C fd] [-j external_journal] [-E extended-options] device

    Check ext2/ext3 file system

    Options:

            -p              Automatic repair (no questions)
            -n              Make no changes to the filesystem
            -y              Assume 'yes' to all questions
            -c              Check for bad blocks and add them to the badblock list
            -f              Force checking even if filesystem is marked clean
            -v              Verbose
            -b superblock   Use alternative superblock
            -B blocksize    Force blocksize when looking for superblock
            -j journal      Set location of the external journal
            -l file         Add to badblocks list
            -L file         Set badblocks list

echo
    echo [-neE] [ARG...]

    Print the specified ARGs to stdout

    Options:

            -n      Suppress trailing newline
            -e      Interpret backslash-escaped characters (i.e., \t=tab)
            -E      Disable interpretation of backslash-escaped characters

    Example:

            $ echo "Erik is cool"
            Erik is cool
            $ echo -e "Erik\nis\ncool"
            Erik
            is
            cool
            $ echo "Erik\nis\ncool"
            Erik\nis\ncool

ed  ed #define ed_full_usage

egrep
    egrep #define egrep_full_usage

eject
    eject [-t] [-T] [DEVICE]

    Eject specified DEVICE (or default /dev/cdrom)

    Options:

            -s      SCSI device
            -t      Close tray
            -T      Open/close tray (toggle)

env env [-iu] [-] [name=value]... [command]

    Print the current environment or run a program after setting up the specified environment

    Options:

            -, -i   Start with an empty environment
            -u      Remove variable from the environment

envdir
    envdir dir prog args

    Set various environment variables as specified by files in the directory dir and run PROG

envuidgid
    envuidgid account prog args

    Set $UID to account's uid and $GID to account's gid and run PROG

ether-wake
    ether-wake [-b] [-i iface] [-p aa:bb:cc:dd[:ee:ff]] MAC

    Send a magic packet to wake up sleeping machines. MAC must be a station address (00:11:22:33:44:55) or a hostname with a known 'ethers' entry.

    Options:

            -b              Send wake-up packet to the broadcast address
            -i iface        Interface to use (default eth0)
            -p pass         Append four or six byte password PW to the packet

expand
    expand [-i] [-t NUM] [FILE|-]

    Convert tabs to spaces, writing to standard output.

    Options:

            -i,--initial    Do not convert tabs after non blanks
            -t,--tabs=N     Tabstops every N chars

expr
    expr EXPRESSION

    Print the value of EXPRESSION to standard output.

    EXPRESSION may be:

            ARG1 | ARG2     ARG1 if it is neither null nor 0, otherwise ARG2
            ARG1 & ARG2     ARG1 if neither argument is null or 0, otherwise 0
            ARG1 < ARG2     1 if ARG1 is less than ARG2, else 0. Similarly:
            ARG1 <= ARG2
            ARG1 = ARG2
            ARG1 != ARG2
            ARG1 >= ARG2
            ARG1 > ARG2
            ARG1 + ARG2     Sum of ARG1 and ARG2. Similarly:
            ARG1 - ARG2
            ARG1 * ARG2
            ARG1 / ARG2
            ARG1 % ARG2
            STRING : REGEXP         Anchored pattern match of REGEXP in STRING
            match STRING REGEXP     Same as STRING : REGEXP
            substr STRING POS LENGTH Substring of STRING, POS counted from 1
            index STRING CHARS      Index in STRING where any CHARS is found, or 0
            length STRING           Length of STRING
            quote TOKEN             Interpret TOKEN as a string, even if
                                    it is a keyword like 'match' or an
                                    operator like '/'
            (EXPRESSION)            Value of EXPRESSION

    Beware that many operators need to be escaped or quoted for shells. Comparisons are arithmetic if both ARGs are numbers, else lexicographical. Pattern matches return the string matched between \( and \) or null; if \( and \) are not used, they return the number of characters matched or 0.

fakeidentd
    fakeidentd [-fiw] [-b ADDR] [STRING]

    Provide fake ident (auth) service

    Options:

            -f      Run in foreground
            -i      Inetd mode
            -w      Inetd 'wait' mode
            -b ADDR Bind to specified address
            STRING  Ident answer string (default is 'nobody')

false
    false

    Return an exit code of FALSE (1)

    Example:

            $ false
            $ echo $?
            1

fbset
    fbset [options] [mode]

    Show and modify frame buffer settings

    Example:

            $ fbset
            mode "1024x768-76"
                    # D: 78.653 MHz, H: 59.949 kHz, V: 75.694 Hz
                    geometry 1024 768 1024 768 16
                    timings 12714 128 32 16 4 128 4
                    accel false
                    rgba 5/11,6/5,5/0,0/0
            endmode

fbsplash
    fbsplash -s IMGFILE [-c] [-d DEV] [-i INIFILE] [-f CMD]

    Options:

            -s      Image
            -c      Hide cursor
            -d      Framebuffer device (default /dev/fb0)
            -i      Config file (var=value):
                            BAR_LEFT,BAR_TOP,BAR_WIDTH,BAR_HEIGHT
                            BAR_R,BAR_G,BAR_B
            -f      Control pipe (else exit after drawing image)
                            commands: 'NN' (% for progress bar) or 'exit'

fdflush
    fdflush DEVICE

    Force floppy disk drive to detect disk change

fdformat
    fdformat [-n] DEVICE

    Format floppy disk

    Options:

            -n      Don't verify after format

fdisk
    fdisk [-uls] [-C CYLINDERS] [-H HEADS] [-S SECTORS] [-b SSZ] DISK

    Change partition table

    Options:

            -u              Start and End are in sectors (instead of cylinders)
            -l              Show partition table for each DISK, then exit
            -s              Show partition sizes in kb for each DISK, then exit
            -b 2048         (for certain MO disks) use 2048-byte sectors
            -C CYLINDERS    Set number of cylinders/heads/sectors
            -H HEADS

            -S SECTORS

fgrep
    fgrep #define fgrep_full_usage

find
    find [PATH...] [EXPRESSION]

    Search for files. The default PATH is the current directory, default EXPRESSION is '-print'

    EXPRESSION may consist of:

            -follow         Dereference symlinks
            -xdev           Don't descend directories on other filesystems
            -maxdepth N     Descend at most N levels. -maxdepth 0 applies
                            tests/actions to command line arguments only
            -mindepth N     Do not act on first N levels
            -name PATTERN   File name (w/o directory name) matches PATTERN
            -iname PATTERN  Case insensitive -name
            -path PATTERN   Path matches PATTERN
            -regex PATTERN  Path matches regex PATTERN
            -type X         File type is X (X is one of: f,d,l,b,c,...)
            -perm NNN       Permissions match any of (+NNN), all of (-NNN),
                            or exactly (NNN)
            -mtime DAYS     Modified time is greater than (+N), less than (-N),
                            or exactly (N) days
            -mmin MINS      Modified time is greater than (+N), less than (-N),
                            or exactly (N) minutes
            -newer FILE     Modified time is more recent than FILE's
            -inum N         File has inode number N
            -user NAME      File is owned by user NAME (numeric user ID allowed)
            -group NAME     File belongs to group NAME (numeric group ID allowed)
            -depth          Process directory name after traversing it
            -size N[bck]    File size is N (c:bytes,k:kbytes,b:512 bytes(def.)).
                            +/-N: file size is bigger/smaller than N
            -print          Print (default and assumed)
            -print0         Delimit output with null characters rather than
                            newlines        USE_FEATURE_FIND_CONTEXT (
            -context        File has specified security context")
            -exec CMD ARG ; Execute CMD with all instances of {} replaced by the
                            matching files
            -prune          Stop traversing current subtree
            -delete         Delete files, turns on -depth option
            (EXPR)          Group an expression

    Example:

            $ find / -name passwd
            /etc/passwd

findfs
    findfs LABEL=label or UUID=uuid

    Find a filesystem device based on a label or UUID.

    Example:

            $ findfs LABEL=MyDevice

flash_eraseall
    flash_eraseall [-jq] MTD_DEVICE

    Erase an MTD device

    Options:

            -j      format the device for jffs2
            -q      don't display progress messages

fold
    fold [-bs] [-w WIDTH] [FILE]

    Wrap input lines in each FILE (standard input by default), writing to standard output

    Options:

            -b      Count bytes rather than columns
            -s      Break at spaces
            -w      Use WIDTH columns instead of 80

free
    free

    Display the amount of free and used system memory

    Example:

            $ free
                          total         used         free       shared      buffers
              Mem:       257628       248724         8904        59644        93124
             Swap:       128516         8404       120112
            Total:       386144       257128       129016

freeramdisk
    freeramdisk DEVICE

    Free all memory used by the specified ramdisk

    Example:

            $ freeramdisk /dev/ram2

fsck
    fsck [-ANPRTV] [-C fd] [-t fstype] [fs-options] [filesys...]

    Check and repair filesystems

    Options:

            -A      Walk /etc/fstab and check all filesystems
            -N      Don't execute, just show what would be done
            -P      With -A, check filesystems in parallel
            -R      With -A, skip the root filesystem
            -T      Don't show title on startup
            -V      Verbose
            -C n    Write status information to specified filedescriptor
            -t type List of filesystem types to check

fsck.minix
    fsck.minix [-larvsmf] /dev/name

    Check MINIX filesystem

    Options:

            -l      List all filenames
            -r      Perform interactive repairs
            -a      Perform automatic repairs
            -v      Verbose
            -s      Output superblock information
            -m      Show "mode not cleared" warnings
            -f      Force file system check

ftpd
    ftpd [-wvS] [-t N] [-T N] [DIR]

    FTP server

    ftpd should be used as an inetd service. ftpd's line for inetd.conf:

            21 stream tcp nowait root ftpd ftpd /files/to/serve
    It also can be ran from tcpsvd:

            tcpsvd -vE 0.0.0.0 21 ftpd /files/to/serve

    Options:

            -w      Allow upload
            -v      Log to stderr
            -S      Log to syslog
            -t,-T   Idle and absolute timeouts
            DIR     Change root to this directory

ftpget
    ftpget [options] remote-host local-file remote-file

    Retrieve a remote file via FTP

    Options:

            -c,--continue   Continue previous transfer
            -v,--verbose    Verbose
            -u,--username   Username
            -p,--password   Password
            -P,--port       Port number

ftpput
    ftpput [options] remote-host remote-file local-file

    Store a local file on a remote machine via FTP

    Options:

            -v,--verbose    Verbose
            -u,--username   Username
            -p,--password   Password
            -P,--port       Port number

fuser
    fuser [options] FILE or PORT/PROTO

    Find processes which use FILEs or PORTs

    Options:

            -m      Find processes which use same fs as FILEs
            -4      Search only IPv4 space
            -6      Search only IPv6 space
            -s      Silent: just exit with 0 if any processes are found
            -k      Kill found processes (otherwise display PIDs)
            -SIGNAL Signal to send (default: TERM)

getenforce
    getenforce #define getenforce_full_usage

getopt
    getopt [OPTIONS]...

    Parse command options

            -a,--alternative                Allow long options starting with single -
            -l,--longoptions=longopts       Long options to be recognized
            -n,--name=progname              The name under which errors are reported
            -o,--options=optstring          Short options to be recognized
            -q,--quiet                      Disable error reporting by getopt(3)
            -Q,--quiet-output               No normal output
            -s,--shell=shell                Set shell quoting conventions
            -T,--test                       Test for getopt(1) version
            -u,--unquoted                   Don't quote the output

    Example:

            $ cat getopt.test
            #!/bin/sh
            GETOPT=`getopt -o ab:c:: --long a-long,b-long:,c-long:: \
                   -n 'example.busybox' -- "$@"`
            if [ $? != 0 ]; then  exit 1; fi
            eval set -- "$GETOPT"
            while true; do
             case $1 in
               -a|--a-long) echo "Option a"; shift;;
               -b|--b-long) echo "Option b, argument '$2'"; shift 2;;
               -c|--c-long)
                 case "$2" in
                   "") echo "Option c, no argument"; shift 2;;
                   *)  echo "Option c, argument '$2'"; shift 2;;
                 esac;;
               --) shift; break;;
               *) echo "Internal error!"; exit 1;;
             esac
            done

getsebool
    getsebool -a or getsebool boolean...

            -a      Show all SELinux booleans

getty
    getty [OPTIONS] BAUD_RATE TTY [TERMTYPE]

    Open a tty, prompt for a login name, then invoke /bin/login

    Options:

            -h              Enable hardware (RTS/CTS) flow control
            -i              Do not display /etc/issue before running login
            -L              Local line, do not do carrier detect
            -m              Get baud rate from modem's CONNECT status message
            -w              Wait for a CR or LF before sending /etc/issue
            -n              Do not prompt the user for a login name
            -f issue_file   Display issue_file instead of /etc/issue
            -l login_app    Invoke login_app instead of /bin/login
            -t timeout      Terminate after timeout if no username is read
            -I initstring   Init string to send before anything else
            -H login_host   Log login_host into the utmp file as the hostname

grep
    grep [-HhrilLnqvsoweFEABCz] PATTERN [FILEs...]

    Search for PATTERN in each FILE or standard input

    Options:

            -H      Prefix output lines with filename where match was found
            -h      Suppress the prefixing filename on output
            -r      Recurse subdirectories
            -i      Ignore case distinctions
            -l      List names of files that match
            -L      List names of files that do not match
            -n      Print line number with output lines
            -q      Quiet. Return 0 if PATTERN is found, 1 otherwise
            -v      Select non-matching lines
            -s      Suppress file open/read error messages
            -c      Only print count of matching lines
            -o      Show only the part of a line that matches PATTERN
            -m MAX  Match up to MAX times per file
            -w      Match whole words only
            -F      PATTERN is a set of newline-separated strings
            -E      PATTERN is an extended regular expression
            -e PTRN Pattern to match
            -f FILE Read pattern from file
            -A      Print NUM lines of trailing context
            -B      Print NUM lines of leading context
            -C      Print NUM lines of output context
            -z      Input is NUL terminated

    Example:

            $ grep root /etc/passwd
            root:x:0:0:root:/root:/bin/bash
            $ grep ^[rR]oo. /etc/passwd
            root:x:0:0:root:/root:/bin/bash

gunzip
    gunzip [OPTION]... [FILE]...

    Uncompress FILEs (or standard input)

    Options:

            -c      Write to standard output
            -f      Force
            -t      Test file integrity

    Example:

            $ ls -la /tmp/BusyBox*
            -rw-rw-r--    1 andersen andersen   557009 Apr 11 10:55 /tmp/BusyBox-0.43.tar.gz
            $ gunzip /tmp/BusyBox-0.43.tar.gz
            $ ls -la /tmp/BusyBox*
            -rw-rw-r--    1 andersen andersen  1761280 Apr 14 17:47 /tmp/BusyBox-0.43.tar

gzip
    gzip [OPTION]... [FILE]...

    Compress FILEs (or standard input)

    Options:

            -c      Write to standard output
            -d      Decompress
            -f      Force

    Example:

            $ ls -la /tmp/busybox*
            -rw-rw-r--    1 andersen andersen  1761280 Apr 14 17:47 /tmp/busybox.tar
            $ gzip /tmp/busybox.tar
            $ ls -la /tmp/busybox*
            -rw-rw-r--    1 andersen andersen   554058 Apr 14 17:49 /tmp/busybox.tar.gz

halt
    halt [-d delay] [-n] [-f] [-w]

    Halt the system

    Options:

            -d      Delay interval for halting
            -n      No call to sync()
            -f      Force halt (don't go through init)
            -w      Only write a wtmp record

hd  hd FILE...

    hd is an alias for hexdump -C

hdparm
    hdparm [options] [device] ..

    Options:

            -a      Get/set fs readahead
            -A      Set drive read-lookahead flag (0/1)
            -b      Get/set bus state (0 == off, 1 == on, 2 == tristate)
            -B      Set Advanced Power Management setting (1-255)
            -c      Get/set IDE 32-bit IO setting
            -C      Check IDE power mode status
            -d      Get/set using_dma flag
            -D      Enable/disable drive defect-mgmt
            -f      Flush buffer cache for device on exit
            -g      Display drive geometry
            -h      Display terse usage information
            -i      Display drive identification
            -I      Detailed/current information directly from drive
            -k      Get/set keep_settings_over_reset flag (0/1)
            -K      Set drive keep_features_over_reset flag (0/1)
            -L      Set drive doorlock (0/1) (removable harddisks only)
            -m      Get/set multiple sector count
            -n      Get/set ignore-write-errors flag (0/1)
            -p      Set PIO mode on IDE interface chipset (0,1,2,3,4,...)
            -P      Set drive prefetch count/*   "
            -q      Change next setting quietly" - not supported ib bbox */
            -Q      Get/set DMA tagged-queuing depth (if supported)
            -r      Get/set readonly flag (DANGEROUS to set)
            -R      Register an IDE interface (DANGEROUS)
            -S      Set standby (spindown) timeout
            -t      Perform device read timings
            -T      Perform cache read timings
            -u      Get/set unmaskirq flag (0/1)
            -U      Un-register an IDE interface (DANGEROUS)
            -v      Defaults; same as -mcudkrag for IDE drives
            -V      Display program version and exit immediately
            -w      Perform device reset (DANGEROUS)
            -W      Set drive write-caching flag (0/1) (DANGEROUS)
            -x      Tristate device for hotswap (0/1) (DANGEROUS)
            -X      Set IDE xfer mode (DANGEROUS)
            -y      Put IDE drive in standby mode
            -Y      Put IDE drive to sleep
            -Z      Disable Seagate auto-powersaving mode
            -z      Re-read partition table

head
    head [OPTION]... [FILE]...

    Print first 10 lines of each FILE to standard output. With more than one FILE, precede each with a header giving the file name. With no FILE, or when FILE is -, read standard input.

    Options:

            -n NUM  Print first NUM lines instead of first 10
            -c NUM  Output the first NUM bytes
            -q      Never output headers giving file names
            -v      Always output headers giving file names

    Example:

            $ head -n 2 /etc/passwd
            root:x:0:0:root:/root:/bin/bash
            daemon:x:1:1:daemon:/usr/sbin:/bin/sh

hexdump
    hexdump [-bcCdefnosvxR] FILE...

    Display file(s) or standard input in a user specified format

    Options:

            -b              One-byte octal display
            -c              One-byte character display
            -C              Canonical hex+ASCII, 16 bytes per line
            -d              Two-byte decimal display
            -e FORMAT STRING
            -f FORMAT FILE
            -n LENGTH       Interpret only LENGTH bytes of input
            -o              Two-byte octal display
            -s OFFSET       Skip OFFSET bytes
            -v              Display all input data
            -x              Two-byte hexadecimal display
            -R              Reverse of 'hexdump -Cv'

hostid
    hostid

    Print out a unique 32-bit identifier for the machine

hostname
    hostname [OPTION] [hostname | -F FILE]

    Get or set hostname or DNS domain name

    Options:

            -s      Short
            -i      Addresses for the hostname
            -d      DNS domain name
            -f      Fully qualified domain name
            -F FILE Use the contents of FILE to specify the hostname

    Example:

            $ hostname
            sage

httpd
    httpd [-c conffile] [-p [ip:]port] [-i] [-f] [-v[v]] [-u user[:grp]] [-r realm] [-m pass] [-h home] [-d/-e string]

    Listen for incoming HTTP requests

    Options:

            -c FILE         Configuration file (default httpd.conf)
            -p [IP:]PORT    Bind to ip:port (default *:80)
            -i              Inetd mode
            -f              Do not daemonize
            -v[v]           Verbose
            -u USER[:GRP]   Set uid/gid after binding to port
            -r REALM        Authentication Realm for Basic Authentication
            -m PASS         Crypt PASS with md5 algorithm
            -h HOME         Home directory (default .)
            -e STRING       HTML encode STRING
            -d STRING       URL decode STRING

hush
    hush #define hush_full_usage

hwclock
    hwclock         [-r|--show] [-s|--hctosys] [-w|--systohc] [-l|--localtime] [-u|--utc] [-f FILE]

    Query and set hardware clock (RTC)

    Options:

            -r      Show hardware clock time
            -s      Set system time from hardware clock
            -w      Set hardware clock to system time
            -u      Hardware clock is in UTC
            -l      Hardware clock is in local time
            -f FILE Use specified device (e.g. /dev/rtc2)

id  id [OPTIONS]... [USER]

    Print information about USER or the current user

    Options:

            -Z      Print the security context
            -u      Print user ID
            -g      Print group ID
            -G      Print supplementary group IDs
            -n      Print name instead of a number
            -r      Print real user ID instead of effective ID

    Example:

            $ id
            uid=1000(andersen) gid=1000(andersen)

ifconfig
    ifconfig [-a] interface [address]

    Configure a network interface

    Options:

            [add ADDRESS[/PREFIXLEN]]
            [del ADDRESS[/PREFIXLEN]]
            [[-]broadcast [ADDRESS]] [[-]pointopoint [ADDRESS]]
            [netmask ADDRESS] [dstaddr ADDRESS]
            [outfill NN] [keepalive NN]
            [hw ether|infiniband ADDRESS] [metric NN] [mtu NN]
            [[-]trailers] [[-]arp] [[-]allmulti]
            [multicast] [[-]promisc] [txqueuelen NN] [[-]dynamic]
            [mem_start NN] [io_addr NN] [irq NN]
            [up|down] ...

ifdown
    ifdown [-ainmvf] ifaces...

    Options:

            -a      De/configure all interfaces automatically
            -i FILE Use FILE for interface definitions
            -n      Print out what would happen, but don't do it
                    (note: doesn't disable mappings)
            -m      Don't run any mappings
            -v      Print out what would happen before doing it
            -f      Force de/configuration

ifenslave
    ifenslave [-cdf] master-iface <slave-iface...>

    Configure network interfaces for parallel routing

    Options:

            -c, --change-active     Change active slave
            -d, --detach            Remove slave interface from bonding device
            -f, --force             Force, even if interface is not Ethernet/*   "
            -r, --receive-slave     Create a receive-only slave" */

    Example:

            To create a bond device, simply follow these three steps :
            - ensure that the required drivers are properly loaded :
              # modprobe bonding ; modprobe <3c59x|eepro100|pcnet32|tulip|...>
            - assign an IP address to the bond device :
              # ifconfig bond0 <addr> netmask <mask> broadcast <bcast>
            - attach all the interfaces you need to the bond device :
              # ifenslave bond0 eth0 eth1 eth2
              If bond0 didn't have a MAC address, it will take eth0's. Then, all
              interfaces attached AFTER this assignment will get the same MAC addr.

              To detach a dead interface without setting the bond device down :
               # ifenslave -d bond0 eth1

              To set the bond device down and automatically release all the slaves :
               # ifconfig bond0 down

              To change active slave :
               # ifenslave -c bond0 eth0

ifup
    ifup [-ainmvf] ifaces...

    Options:

            -a      De/configure all interfaces automatically
            -i FILE Use FILE for interface definitions
            -n      Print out what would happen, but don't do it
                    (note: doesn't disable mappings)
            -m      Don't run any mappings
            -v      Print out what would happen before doing it
            -f      Force de/configuration

inetd
    inetd [-fe] [-q N] [-R N] [CONFFILE]

    Listen for network connections and launch programs

    Options:

            -f      Run in foreground
            -e      Log to stderr
            -q N    Socket listen queue (default: 128)
            -R N    Pause services after N connects/min
                    (default: 0 - disabled)

init
    init

    Init is the parent of all processes

    This version of init is designed to be run only by the kernel.

    BusyBox init doesn't support multiple runlevels. The runlevels field of the /etc/inittab file is completely ignored by BusyBox init. If you want runlevels, use sysvinit.

    BusyBox init works just fine without an inittab. If no inittab is found, it has the following default behavior:

            ::sysinit:/etc/init.d/rcS
            ::askfirst:/bin/sh
            ::ctrlaltdel:/sbin/reboot
            ::shutdown:/sbin/swapoff -a
            ::shutdown:/bin/umount -a -r
            ::restart:/sbin/init

    if it detects that /dev/console is _not_ a serial console, it will also run:

            tty2::askfirst:/bin/sh
            tty3::askfirst:/bin/sh
            tty4::askfirst:/bin/sh

    If you choose to use an /etc/inittab file, the inittab entry format is as follows:

            <id>:<runlevels>:<action>:<process>

            <id>:

                    WARNING: This field has a non-traditional meaning for BusyBox init!
                    The id field is used by BusyBox init to specify the controlling tty for
                    the specified process to run on. The contents of this field are
                    appended to "/dev/" and used as-is. There is no need for this field to
                    be unique, although if it isn't you may have strange results. If this
                    field is left blank, the controlling tty is set to the console. Also
                    note that if BusyBox detects that a serial console is in use, then only
                    entries whose controlling tty is either the serial console or /dev/null
                    will be run. BusyBox init does nothing with utmp. We don't need no
                    stinkin' utmp.

            <runlevels>:

                    The runlevels field is completely ignored.

            <action>:

                    Valid actions include: sysinit, respawn, askfirst, wait,
                    once, restart, ctrlaltdel, and shutdown.

                    The available actions can be classified into two groups: actions
                    that are run only once, and actions that are re-run when the specified
                    process exits.

                    Run only-once actions:

                            'sysinit' is the first item run on boot. init waits until all
                            sysinit actions are completed before continuing. Following the
                            completion of all sysinit actions, all 'wait' actions are run.
                            'wait' actions, like 'sysinit' actions, cause init to wait until
                            the specified task completes. 'once' actions are asynchronous,
                            therefore, init does not wait for them to complete. 'restart' is
                            the action taken to restart the init process. By default this should
                            simply run /sbin/init, but can be a script which runs pivot_root or it
                            can do all sorts of other interesting things. The 'ctrlaltdel' init
                            actions are run when the system detects that someone on the system
                            console has pressed the CTRL-ALT-DEL key combination. Typically one
                            wants to run 'reboot' at this point to cause the system to reboot.
                            Finally the 'shutdown' action specifies the actions to taken when
                            init is told to reboot. Unmounting filesystems and disabling swap
                            is a very good here.

                    Run repeatedly actions:

                            'respawn' actions are run after the 'once' actions. When a process
                            started with a 'respawn' action exits, init automatically restarts
                            it. Unlike sysvinit, BusyBox init does not stop processes from
                            respawning out of control. The 'askfirst' actions acts just like
                            respawn, except that before running the specified process it
                            displays the line "Please press Enter to activate this console."
                            and then waits for the user to press enter before starting the
                            specified process.

                    Unrecognized actions (like initdefault) will cause init to emit an
                    error message, and then go along with its business. All actions are
                    run in the order they appear in /etc/inittab.

            <process>:

                    Specifies the process to be executed and its command line.

    Example /etc/inittab file:

            # This is run first except when booting in single-user mode
            #
            ::sysinit:/etc/init.d/rcS

            # /bin/sh invocations on selected ttys
            #
            # Start an "askfirst" shell on the console (whatever that may be)
            ::askfirst:-/bin/sh
            # Start an "askfirst" shell on /dev/tty2-4
            tty2::askfirst:-/bin/sh
            tty3::askfirst:-/bin/sh
            tty4::askfirst:-/bin/sh

            # /sbin/getty invocations for selected ttys
            #
            tty4::respawn:/sbin/getty 38400 tty4
            tty5::respawn:/sbin/getty 38400 tty5

            # Example of how to put a getty on a serial line (for a terminal)
            #
            #::respawn:/sbin/getty -L ttyS0 9600 vt100
            #::respawn:/sbin/getty -L ttyS1 9600 vt100
            #
            # Example how to put a getty on a modem line
            #::respawn:/sbin/getty 57600 ttyS2

            # Stuff to do when restarting the init process
            ::restart:/sbin/init

            # Stuff to do before rebooting
            ::ctrlaltdel:/sbin/reboot
            ::shutdown:/bin/umount -a -r
            ::shutdown:/sbin/swapoff -a

inotifyd
    inotifyd PROG FILE1[:MASK] ...

    Run PROG on filesystem changes. When a filesystem event matching MASK occurs on FILEn, PROG <actual_event(s)> <FILEn> [<subfile_name>] is run. Events:

            a       File is accessed
            c       File is modified
            e       Metadata changed
            w       Writtable file is closed
            0       Unwrittable file is closed
            r       File is opened
            D       File is deleted
            M       File is moved
            u       Backing fs is unmounted
            o       Event queue overflowed
            x       File can't be watched anymore
    If watching a directory:

            m       Subfile is moved into dir
            y       Subfile is moved out of dir
            n       Subfile is created
            d       Subfile is deleted

    inotifyd waits for PROG to exit. When x event happens for all FILEs, inotifyd exits

insmod
    insmod [OPTION]... MODULE [symbol=value]...

    Load the specified kernel modules into the kernel

    Options:

            -f      Force module to load into the wrong kernel version
            -k      Make module autoclean-able
            -v      Verbose
            -q      Quiet
            -L      Lock to prevent simultaneous loads of a module
            -m      Output load map to stdout
            -o NAME Set internal module name to NAME
            -x      Do not export externs

install
    install [-cdDsp] [-o USER] [-g GRP] [-m MODE] [source] dest|directory

    Copy files and set attributes

    Options:

            -c      Just copy (default)
            -d      Create directories
            -D      Create leading target directories
            -s      Strip symbol table
            -p      Preserve date
            -o USER Set ownership
            -g GRP  Set group ownership
            -m MODE Set permissions
            -Z      Set security context

ionice
    ionice [-c 1-3] [-n 0-7] [-p PID] [PROG]

    Change I/O scheduling class and priority

    Options:

            -c      Class. 1:realtime 2:best-effort 3:idle
            -n      Priority

ip  ip [OPTIONS] {address | route | link | tunnel | rule} {COMMAND}

    ip [OPTIONS] OBJECT {COMMAND} where OBJECT := {address | route | link | tunnel | rule} OPTIONS := { -f[amily] { inet | inet6 | link } | -o[neline] }

ipaddr
    ipaddr { {add|del} IFADDR dev STRING | {show|flush}
            [dev STRING] [to PREFIX] }

    ipaddr {add|delete} IFADDR dev STRING ipaddr {show|flush} [dev STRING] [scope SCOPE-ID]

            [to PREFIX] [label PATTERN]
            IFADDR := PREFIX | ADDR peer PREFIX
            [broadcast ADDR] [anycast ADDR]
            [label STRING] [scope SCOPE-ID]
            SCOPE-ID := [host | link | global | NUMBER]

ipcalc
    ipcalc [OPTION]... ADDRESS[[/]NETMASK] [NETMASK]

    Calculate IP network settings from a IP address

    Options:

            -b,--broadcast  Display calculated broadcast address
            -n,--network    Display calculated network address
            -m,--netmask    Display default netmask for IP
            -p,--prefix     Display the prefix for IP/NETMASK
            -h,--hostname   Display first resolved host name
            -s,--silent     Don't ever display error messages               )

ipcrm
    ipcrm [-MQS key] [-mqs id]

    Upper-case options MQS remove an object by shmkey value. Lower-case options remove an object by shmid value.

    Options:

            -mM     Remove memory segment after last detach
            -qQ     Remove message queue
            -sS     Remove semaphore

ipcs
    ipcs [[-smq] -i shmid] | [[-asmq] [-tcplu]]

            -i      Show specific resource
    Resource specification:

            -m      Shared memory segments
            -q      Message queues
            -s      Semaphore arrays
            -a      All (default)
    Output format:

            -t      Time
            -c      Creator
            -p      Pid
            -l      Limits
            -u      Summary

iplink
    iplink

    iplink set DEVICE { up | down | arp | multicast { on | off } |

                            dynamic { on | off } |
                            mtu MTU }
    iplink show [DEVICE]

iproute
    iproute { list | flush | { add | del | change | append |
            replace | monitor } ROUTE }

    iproute { list | flush } SELECTOR iproute get ADDRESS [from ADDRESS iif STRING]

                            [oif STRING]  [tos TOS]
    iproute { add | del | change | append | replace | monitor } ROUTE

                            SELECTOR := [root PREFIX] [match PREFIX] [proto RTPROTO]
                            ROUTE := [TYPE] PREFIX [tos TOS] [proto RTPROTO]
                                    [metric METRIC]

iprule
    iprule {[list | add | del] RULE}

    iprule [list | add | del] SELECTOR ACTION

            SELECTOR := [from PREFIX] [to PREFIX] [tos TOS] [fwmark FWMARK]
                            [dev STRING] [pref NUMBER]
            ACTION := [table TABLE_ID] [nat ADDRESS]
                            [prohibit | reject | unreachable]
                            [realms [SRCREALM/]DSTREALM]
            TABLE_ID := [local | main | default | NUMBER]

iptunnel
    iptunnel { add | change | del | show } [NAME]
        [mode { ipip | gre | sit }]
        [remote ADDR] [local ADDR] [ttl TTL]

    iptunnel { add | change | del | show } [NAME]

            [mode { ipip | gre | sit }] [remote ADDR] [local ADDR]
            [[i|o]seq] [[i|o]key KEY] [[i|o]csum]
            [ttl TTL] [tos TOS] [[no]pmtudisc] [dev PHYS_DEV]

kbd_mode
    kbd_mode [-a|k|s|u] [-C TTY]

    Report or set the keyboard mode

    Options set mode:

            -a      Default (ASCII)
            -k      Medium-raw (keyboard)
            -s      Raw (scancode)
            -u      Unicode (utf-8)
            -C TTY  Affect TTY instead of /dev/tty

kill
    kill [-l] [-SIG] PID...

    Send a signal (default is TERM) to given PIDs

    Options:

            -l      List all signal names and numbers/*   "
            -s SIG  Yet another way of specifying SIG" */

    Example:

            $ ps | grep apache
            252 root     root     S [apache]
            263 www-data www-data S [apache]
            264 www-data www-data S [apache]
            265 www-data www-data S [apache]
            266 www-data www-data S [apache]
            267 www-data www-data S [apache]
            $ kill 252

killall
    killall [-l] [-q] [-SIG] process-name...

    Send a signal (default is TERM) to given processes

    Options:

            -l      List all signal names and numbers/*   "
            -s SIG  Yet another way of specifying SIG" */
            -q      Do not complain if no processes were killed

    Example:

            $ killall apache

killall5
    killall5 [-l] [-SIG] [-o PID]...

    Send a signal (default is TERM) to all processes outside current session

    Options:

            -l      List all signal names and numbers
            -o PID  Do not signal this PID/*   "
            -s SIG  Yet another way of specifying SIG" */

klogd
    klogd [-c N] [-n]

    Kernel logger

    Options:

            -c N    Only messages with level < N are printed to console
            -n      Run in foreground

lash
    lash [FILE]... or: sh -c command [args]...

    lash is deprecated, please use hush

last
    last [-HW] [-f file]

    Show listing of the last users that logged into the system

    Options:/* "

            -H      Show header line" */
            -W      Display with no host column truncation
            -f file Read from file instead of /var/log/wtmp

length
    length STRING

    Print STRING's length

    Example:

            $ length Hello
            5

less
    less [-EMNmh~I?] [FILE...]

    View a file or list of files. The position within files can be changed, and files can be manipulated in various ways.

    Options:

            -E      Quit once the end of a file is reached
            -M,-m   Display a status line containing the line numbers
                    and percentage through the file
            -N      Prefix line numbers to each line
            -I      Ignore case in all searches
            -~      Suppress ~s displayed past the end of the file

linux32
    linux32 #define linux32_full_usage

linux64
    linux64 #define linux64_full_usage

linuxrc
    linuxrc #define linuxrc_full_usage

ln  ln [OPTION] TARGET... LINK_NAME|DIRECTORY

    Create a link named LINK_NAME or DIRECTORY to the specified TARGET. Use '--' to indicate that all following arguments are non-options.

    Options:

            -s      Make symlinks instead of hardlinks
            -f      Remove existing destination files
            -n      Don't dereference symlinks - treat like normal file
            -b      Make a backup of the target (if exists) before link operation
            -S suf  Use suffix instead of ~ when making backup files

    Example:

            $ ln -s BusyBox /tmp/ls
            $ ls -l /tmp/ls
            lrwxrwxrwx    1 root     root            7 Apr 12 18:39 ls -> BusyBox*

load_policy
    load_policy #define load_policy_full_usage

loadfont
    loadfont < font

    Load a console font from standard input/* "

            -C TTY  Affect TTY instead of /dev/tty" */

    Example:

            $ loadfont < /etc/i18n/fontname

loadkmap
    loadkmap < keymap

    Load a binary keyboard translation table from standard input /* "

            -C TTY  Affect TTY instead of /dev/tty" */

    Example:

            $ loadkmap < /etc/i18n/lang-keymap

logger
    logger [OPTION]... [MESSAGE]

    Write MESSAGE to the system log. If MESSAGE is omitted, log stdin.

    Options:

            -s      Log to stderr as well as the system log
            -t TAG  Log using the specified tag (defaults to user name)
            -p PRIO Priority (numeric or facility.level pair)

    Example:

            $ logger "hello"

login
    login [-p] [-h HOST] [[-f] USER]

    Begin a new session on the system

    Options:

            -f      Do not authenticate (user already authenticated)
            -h      Name of the remote host
            -p      Preserve environment

logname
    logname

    Print the name of the current user

    Example:

            $ logname
            root

logread
    logread [OPTION]...

    Show messages in syslogd's circular buffer

    Options:

            -f      Output data as log grows

losetup
    losetup [-o OFS] LOOPDEV FILE - associate loop devices
        losetup -d LOOPDEV - disassociate
        losetup [-f] - show

    Options:

            -o OFS  Start OFS bytes into FILE
            -f      Show first free loop device

    No arguments will display all current associations. One argument (losetup /dev/loop1) will display the current association (if any), or disassociate it (with -d). The display shows the offset and filename of the file the loop device is currently bound to.

    Two arguments (losetup /dev/loop1 file.img) create a new association, with an optional offset (-o 12345). Encryption is not yet supported. losetup -f will show the first loop free loop device

lpd lpd SPOOLDIR [HELPER [ARGS...]]

    SPOOLDIR must contain (symlinks to) device nodes or directories with names matching print queue names. In the first case, jobs are sent directly to the device. Otherwise each job is stored in queue directory and HELPER program is called. Name of file to print is passed in $DATAFILE variable. Example:

            tcpsvd -E 0 515 softlimit -m 999999 lpd /var/spool ./print

lpq lpq [-P queue[@host[:port]]] [-U USERNAME] [-d JOBID...] [-fs]

    Options:

            -P      lp service to connect to (else uses $PRINTER)
            -d      Delete jobs
            -f      Force any waiting job to be printed
            -s      Short display

lpr lpr -P queue[@host[:port]] -U USERNAME -J TITLE -Vmh [FILE...]

    Options:

            -P      lp service to connect to (else uses $PRINTER)
            -m      Send mail on completion
            -h      Print banner page too
            -V      Verbose

ls  ls [-1AacCdeFilnpLRrSsTtuvwxXhkK] [filenames...]

    List directory contents

    Options:

            -1      List in a single column
            -A      Don't list . and ..
            -a      Don't hide entries starting with .
            -C      List by columns
            -c      With -l: sort by ctime
            --color[={always,never,auto}]   Control coloring
            -d      List directory entries instead of contents
            -e      List full date and time
            -F      Append indicator (one of */=@|) to entries
            -i      List inode numbers
            -l      Long listing format
            -n      List numeric UIDs and GIDs instead of names
            -p      Append indicator (one of /=@|) to entries
            -L      List entries pointed to by symlinks
            -R      List subdirectories recursively
            -r      Sort in reverse order
            -S      Sort by file size
            -s      List the size of each file, in blocks
            -T NUM  Assume tabstop every NUM columns
            -t      With -l: sort by modification time
            -u      With -l: sort by access time
            -v      Sort by version
            -w NUM  Assume the terminal is NUM columns wide
            -x      List by lines
            -X      Sort by extension
            -h      List sizes in human readable format (1K 243M 2G)
            -k      List security context
            -K      List security context in long format
            -Z      List security context and permission

lsattr
    lsattr [-Radlv] [files...]

    List file attributes on an ext2 fs

    Options:

            -R      Recursively list subdirectories
            -a      Do not hide entries starting with .
            -d      List directory entries instead of contents
            -l      List long flag names
            -v      List the file's version/generation number

lsmod
    lsmod

    List the currently loaded kernel modules

lzmacat
    lzmacat FILE

    Uncompress to stdout

makedevs
    makedevs [-d device_table] rootdir

    Create a range of special files as specified in a device table. Device table entries take the form of: <type> <mode> <uid> <gid> <major> <minor> <start> <inc> <count> Where name is the file name, type can be one of:

            f       Regular file
            d       Directory
            c       Character device
            b       Block device
            p       Fifo (named pipe)
    uid is the user id for the target file, gid is the group id for the
    target file. The rest of the entries (major, minor, etc) apply to
    to device special files. A '-' may be used for blank entries.

    Example:

            For example:
            <name>    <type> <mode><uid><gid><major><minor><start><inc><count>
            /dev         d   755    0    0    -      -      -      -    -
            /dev/console c   666    0    0    5      1      -      -    -
            /dev/null    c   666    0    0    1      3      0      0    -
            /dev/zero    c   666    0    0    1      5      0      0    -
            /dev/hda     b   640    0    0    3      0      0      0    -
            /dev/hda     b   640    0    0    3      1      1      1    15

            Will Produce:
            /dev
            /dev/console
            /dev/null
            /dev/zero
            /dev/hda
            /dev/hda[0-15]

makemime
    makemime [OPTION]... [FILE]...

    Create MIME-encoded message

    Options:

            -C      Charset
            -e      Transfer encoding. Ignored. base64 is assumed

    Other options are silently ignored.

man man [OPTION]... [MANPAGE]...

    Format and display manual page

    Options:

            -a      Display all pages
            -w      Show page locations

matchpathcon
    matchpathcon [-n] [-N] [-f file_contexts_file] [-p prefix] [-V]

            -n      Do not display path
            -N      Do not use translations
            -f      Use alternate file_context file
            -p      Use prefix to speed translations
            -V      Verify file context on disk matches defaults

md5sum
    md5sum [OPTION] [FILEs...]
       or: md5sum [OPTION] -c [FILE]

    Print or check MD5 checksums

    Options:

            -c      Check sums against given list
            -s      Don't output anything, status code shows success
            -w      Warn about improperly formatted checksum lines

    Example:

            $ md5sum < busybox
            6fd11e98b98a58f64ff3398d7b324003
            $ md5sum busybox
            6fd11e98b98a58f64ff3398d7b324003  busybox
            $ md5sum -c -
            6fd11e98b98a58f64ff3398d7b324003  busybox
            busybox: OK
            ^D

mdev
    mdev [-s]

            -s      Scan /sys and populate /dev during system boot

    It can be run by kernel as a hotplug helper. To activate it:

     echo /bin/mdev >/proc/sys/kernel/hotplug
    It uses /etc/mdev.conf with lines
    [-]DEVNAME UID:GID PERM [>|=PATH] [@|$|*COMMAND]

             The mdev config file contains lines that look like:
      hd[a-z][0-9]* 0:3 660

    That's device name (with regex match), uid:gid, and permissions.

    Optionally, that can be followed (on the same line) by a special character and a command line to run after creating/before deleting the corresponding device(s). The environment variable $MDEV indicates the active device node (which is useful if it's a regex match). For example:

      hdc root:cdrom 660  *ln -s $MDEV cdrom

    The special characters are @ (run after creating), $ (run before deleting), and * (run both after creating and before deleting). The commands run in the /dev directory, and use system() which calls /bin/sh.

    Config file parsing stops on the first matching line. If no config entry is matched, devices are created with default 0:0 660. (Make the last line match .* to override this.)

mesg
    mesg [y|n]

    Control write access to your terminal

            y       Allow write access to your terminal
            n       Disallow write access to your terminal

microcom
    microcom [-d DELAY] [-t TIMEOUT] [-s SPEED] [-X] TTY

    Copy bytes for stdin to TTY and from TTY to stdout

    Options:

            -d      Wait up to DELAY ms for TTY output before sending every
                    next byte to it
            -t      Exit if both stdin and TTY are silent for TIMEOUT ms
            -s      Set serial line to SPEED
            -X      Disable special meaning of NUL and Ctrl-X from stdin

mkdir
    mkdir [OPTION] DIRECTORY...

    Create DIRECTORY

    Options:

            -m      Set permission mode (as in chmod), not rwxrwxrwx - umask
            -p      No error if existing, make parent directories as needed
            -Z      Set security context

    Example:

            $ mkdir /tmp/foo
            $ mkdir /tmp/foo
            /tmp/foo: File exists
            $ mkdir /tmp/foo/bar/baz
            /tmp/foo/bar/baz: No such file or directory
            $ mkdir -p /tmp/foo/bar/baz

mke2fs
    mke2fs [-c|-l filename] [-b block-size] [-f fragment-size] [-g blocks-per-group] [-i bytes-per-inode] [-j] [-J journal-options] [-N number-of-inodes] [-n] [-m reserved-blocks-percentage] [-o creator-os] [-O feature[,...]] [-q] [r fs-revision-level] [-E extended-options] [-v] [-F] [-L volume-label] [-M last-mounted-directory] [-S] [-T filesystem-type] device [blocks-count]

            -b size         Block size in bytes
            -c              Check for bad blocks before creating
            -E opts         Set extended options
            -f size         Fragment size in bytes
            -F              Force (ignore sanity checks)
            -g num          Number of blocks in a block group
            -i ratio        The bytes/inode ratio
            -j              Create a journal (ext3)
            -J opts         Set journal options (size/device)
            -l file         Read bad blocks list from file
            -L lbl          Set the volume label
            -m percent      Percent of fs blocks to reserve for admin
            -M dir          Set last mounted directory
            -n              Do not actually create anything
            -N num          Number of inodes to create
            -o os           Set the 'creator os' field
            -O features     Dir_index/filetype/has_journal/journal_dev/sparse_super
            -q              Quiet
            -r rev          Set filesystem revision
            -S              Write superblock and group descriptors only
            -T fs-type      Set usage type (news/largefile/largefile4)
            -v              Verbose

mkfifo
    mkfifo [OPTIONS] name

    Create named pipe (identical to 'mknod name p')

    Options:

            -m MODE Mode (default a=rw)
            -Z      Set security context

mkfs.minix
    mkfs.minix [-c | -l filename] [-nXX] [-iXX] /dev/name [blocks]

    Make a MINIX filesystem

    Options:

            -c              Check device for bad blocks
            -n [14|30]      Maximum length of filenames
            -i INODES       Number of inodes for the filesystem
            -l FILENAME     Read bad blocks list from FILENAME
            -v              Make version 2 filesystem

mkfs_vfat
    mkfs_vfat [-v] [-n LABEL] FILE_OR_DEVICE [SIZE_IN_KB]

    Make a FAT32 filesystem

    Options:/* "

            -c      Check device for bad blocks" */
            -v      Verbose/*   "
            -I      Allow to use entire disk device (e.g. /dev/hda)" */
            -n LBL  Volume label

mknod
    mknod [OPTIONS] NAME TYPE MAJOR MINOR

    Create a special file (block, character, or pipe)

    Options:

            -m      Create the special file using the specified mode (default a=rw)
    TYPEs include:

            b:      Make a block device
            c or u: Make a character device
            p:      Make a named pipe (MAJOR and MINOR are ignored)
            -Z      Set security context

    Example:

            $ mknod /dev/fd0 b 2 0
            $ mknod -m 644 /tmp/pipe p

mkpasswd
    mkpasswd [OPTIONS] [PASSWORD] [SALT]

    Crypt the PASSWORD using crypt(3)

    Options:

            -P,--password-fd=NUM    Read password from fd NUM/*   "
            -s,--stdin              Use stdin; like -P0" */
            -m,--method=TYPE        Encryption method TYPE
            -S,--salt=SALT

mkswap
    mkswap DEVICE

    Prepare block device to be used as swap partition

mktemp
    mktemp [-dt] [-p DIR] [TEMPLATE]

    Create a temporary file with name based on TEMPLATE and print its name. TEMPLATE must end with XXXXXX (e.g. [/dir/]nameXXXXXX).

    Options:

            -d      Make a directory instead of a file/*   "
            -q      Fail silently if an error occurs" - we ignore it */
            -t      Generate a path rooted in temporary directory
            -p DIR  Use DIR as a temporary directory (implies -t)

    For -t or -p, directory is chosen as follows: $TMPDIR if set, else -p DIR, else /tmp

    Example:

            $ mktemp /tmp/temp.XXXXXX
            /tmp/temp.mWiLjM
            $ ls -la /tmp/temp.mWiLjM
            -rw-------    1 andersen andersen        0 Apr 25 17:10 /tmp/temp.mWiLjM

modprobe
    modprobe [-knqrsv] MODULE [symbol=value...]

    Options:

            -k      Make module autoclean-able
            -n      Dry run
            -q      Quiet
            -r      Remove module (stacks) or do autoclean
            -s      Report via syslog instead of stderr
            -v      Verbose
            -b      Apply blacklist to module names too

    modprobe can (un)load a stack of modules, passing each module options (when loading). modprobe uses a configuration file to determine what option(s) to pass each module it loads.

    The configuration file is searched (in this order):

        /etc/modprobe.conf (2.6 only)
        /etc/modules.conf
        /etc/conf.modules (deprecated)

    They all have the same syntax (see below). If none is present, it is _not_ an error; each loaded module is then expected to load without options. Once a file is found, the others are tested for.

    /etc/modules.conf entry format:

      alias <alias_name> <mod_name>
        Makes it possible to modprobe alias_name, when there is no such module.
        It makes sense if your mod_name is long, or you want a more representative
        name for that module (eg. 'scsi' in place of 'aha7xxx').
        This makes it also possible to use a different set of options (below) for
        the module and the alias.
        A module can be aliased more than once.

      options <mod_name|alias_name> <symbol=value...>
        When loading module mod_name (or the module aliased by alias_name), pass
        the "symbol=value" pairs as option to that module.

    Sample /etc/modules.conf file:

      options tulip irq=3
      alias tulip tulip2
      options tulip2 irq=4 io=0x308

    Other functionality offered by 'classic' modprobe is not available in this implementation.

    If module options are present both in the config file, and on the command line, then the options from the command line will be passed to the module _after_ the options from the config file. That way, you can have defaults in the config file, and override them for a specific usage from the command line.

    Example:

            (with the above /etc/modules.conf):

            $ modprobe tulip
               will load the module 'tulip' with default option 'irq=3'

            $ modprobe tulip irq=5
               will load the module 'tulip' with option 'irq=5', thus overriding the default

            $ modprobe tulip2
               will load the module 'tulip' with default options 'irq=4 io=0x308',
               which are the default for alias 'tulip2'

            $ modprobe tulip2 irq=8
               will load the module 'tulip' with default options 'irq=4 io=0x308 irq=8',
               which are the default for alias 'tulip2' overridden by the option 'irq=8'

               from the command line

            $ modprobe tulip2 irq=2 io=0x210
               will load the module 'tulip' with default options 'irq=4 io=0x308 irq=4 io=0x210',
               which are the default for alias 'tulip2' overridden by the options 'irq=2 io=0x210'

               from the command line

more
    more [FILE...]

    View FILE or standard input one screenful at a time

    Example:

            $ dmesg | more

mount
    mount [flags] DEVICE NODE [-o OPT,OPT]

    Mount a filesystem. Filesystem autodetection requires /proc be mounted.

    Options:

            -a              Mount all filesystems in fstab
            -f              Update /etc/mtab, but don't mount
            -n              Don't update /etc/mtab
            -r              Read-only mount
            -w              Read-write mount (default)
            -t FSTYPE       Filesystem type
            -O OPT          Mount only filesystems with option OPT (-a only)
    B<-o> OPT:

            loop            Ignored (loop devices are autodetected)
            [a]sync         Writes are [a]synchronous
            [no]atime       Disable/enable updates to inode access times
            [no]diratime    Disable/enable atime updates to directories
            [no]relatime    Disable/enable atime updates relative to modification time
            [no]dev         (Dis)allow use of special device files
            [no]exec        (Dis)allow use of executable files
            [no]suid        (Dis)allow set-user-id-root programs
            [r]shared       Convert [recursively] to a shared subtree
            [r]slave        Convert [recursively] to a slave subtree
            [r]private      Convert [recursively] to a private subtree
            [un]bindable    Make mount point [un]able to be bind mounted
            bind            Bind a directory to an additional location
            move            Relocate an existing mount point
            remount         Remount a mounted filesystem, changing its flags
            ro/rw           Read-only/read-write mount

    There are EVEN MORE flags that are specific to each filesystem You'll have to see the written documentation for those filesystems

    Returns 0 for success, number of failed mounts for -a, or errno for one mount.

    Example:

            $ mount
            /dev/hda3 on / type minix (rw)
            proc on /proc type proc (rw)
            devpts on /dev/pts type devpts (rw)
            $ mount /dev/fd0 /mnt -t msdos -o ro
            $ mount /tmp/diskimage /opt -t ext2 -o loop
            $ mount cd_image.iso mydir

mountpoint
    mountpoint [-q] <[-dn] DIR | -x DEVICE>

    Check if the directory is a mountpoint

    Options:

            -q      Quiet
            -d      Print major/minor device number of the filesystem
            -n      Print device name of the filesystem
            -x      Print major/minor device number of the blockdevice

    Example:

            $ mountpoint /proc
            /proc is not a mountpoint
            $ mountpoint /sys
            /sys is a mountpoint

msh msh #define msh_full_usage

mt  mt [-f device] opcode value

    Control magnetic tape drive operation

    Available Opcodes:

    bsf bsfm bsr bss datacompression drvbuffer eof eom erase fsf fsfm fsr fss load lock mkpart nop offline ras1 ras2 ras3 reset retension rewind rewoffline seek setblk setdensity setpart tell unload unlock weof wset

mv  mv [OPTION]... SOURCE DEST or: mv [OPTION]... SOURCE... DIRECTORY

    Rename SOURCE to DEST, or move SOURCE(s) to DIRECTORY

    Options:

            -f      Don't prompt before overwriting
            -i      Interactive, prompt before overwrite

    Example:

            $ mv /tmp/foo /bin/bar

nameif
    nameif [-s] [-c FILE] [{IFNAME MACADDR}]

    Rename network interface while it in the down state

    Options:

            -c FILE         Use configuration file (default is /etc/mactab)
            -s              Use syslog (LOCAL0 facility)
            IFNAME MACADDR  new_interface_name interface_mac_address

    Example:

            $ nameif -s dmz0 00:A0:C9:8C:F6:3F
             or
            $ nameif -c /etc/my_mactab_file

nc  nc [-options] hostname port - connect nc [-options] -l -p port [hostname] [port] - listen

    Options:

            -e prog [args]  Program to exec after connect (must be last)
            -l              Listen mode, for inbound connects
            -n              Don't do DNS resolution
            -s addr         Local address
            -p port         Local port
            -u              UDP mode
            -v              Verbose (cumulative: -vv)
            -w secs         Timeout for connects and final net reads
            -i sec          Delay interval for lines sent" /* ", ports scanned" */
            -o file         Hex dump of traffic
            -z              Zero-I/O mode (scanning)/*   "
            -r              Randomize local and remote ports" */

             To use netcat as a terminal emulator on a serial port:

    $ stty 115200 -F /dev/ttyS0 $ stty raw -echo -ctlecho && nc -f /dev/ttyS0

    Example:

            $ nc foobar.somedomain.com 25
            220 foobar ESMTP Exim 3.12 #1 Sat, 15 Apr 2000 00:03:02 -0600
            help
            214-Commands supported:
            214-    HELO EHLO MAIL RCPT DATA AUTH
            214     NOOP QUIT RSET HELP
            quit
            221 foobar closing connection

netstat
    netstat [-laentuwxrWp]

    Display networking information

    Options:

            -l      Display listening server sockets
            -a      Display all sockets (default: connected)
            -e      Display other/more information
            -n      Don't resolve names
            -t      Tcp sockets
            -u      Udp sockets
            -w      Raw sockets
            -x      Unix sockets
            -r      Display routing table
            -W      Display with no column truncation
            -p      Display PID/Program name for sockets

nice
    nice [-n ADJUST] [COMMAND [ARG]...]

    Run a program with modified scheduling priority

    Options:

            -n ADJUST       Adjust the scheduling priority by ADJUST

nmeter
    nmeter format_string

    Monitor system in real time

    Format specifiers:
    %Nc or %[cN]    Monitor CPU. N - bar size, default 10

                    (displays: S:system U:user N:niced D:iowait I:irq i:softirq)
    %[niface]       Monitor network interface 'iface'
    %m              Monitor allocated memory
    %[mf]           Monitor free memory
    %[mt]           Monitor total memory
    %s              Monitor allocated swap
    %f              Monitor number of used file descriptors
    %Ni             Monitor total/specific IRQ rate
    %x              Monitor context switch rate
    %p              Monitor forks
    %[pn]           Monitor # of processes
    %b              Monitor block io
    %Nt             Show time (with N decimal points)
    %Nd             Milliseconds between updates (default=1000)
    %r              Print <cr> instead of <lf> at EOL

    Example:

            nmeter '%250d%t %20c int %i bio %b mem %m forks%p'

nohup
    nohup COMMAND [ARGS]

    Run a command immune to hangups, with output to a non-tty

    Example:

            $ nohup make &

nslookup
    nslookup [HOST] [SERVER]

    Query the nameserver for the IP address of the given HOST optionally using a specified DNS server

    Example:

            $ nslookup localhost
            Server:     default
            Address:    default

            Name:       debian
            Address:    127.0.0.1

od  od [-aBbcDdeFfHhIiLlOovXx] [-t TYPE] [FILE]

    Write an unambiguous representation, octal bytes by default, of FILE to standard output. With no FILE or when FILE is -, read standard input.

openvt
    openvt [-c NUM] [-sw] [COMMAND [ARGS]]

    Start COMMAND on a new virtual terminal

    Options:

            -c      Use specified VT
            -s      Switch to the VT/*   "
            -l      Run COMMAND as login shell (by prepending '-')" */
            -w      Wait for COMMAND to exit

    Example:

            openvt 2 /bin/ash

parse
    parse [-n maxtokens] [-m mintokens] [-d delims] [-f flags] file ...

    [-n maxtokens] [-m mintokens] [-d delims] [-f flags] file ...

passwd
    passwd [OPTION] [name]

    Change user's password. If no name is specified, changes the password for the current user.

    Options:

            -a      Algorithm to use for password (choices: des, md5)" /* ", sha1)" */
            -d      Delete password for the account
            -l      Lock (disable) account
            -u      Unlock (re-enable) account

patch
    patch [-p NUM] [-i DIFF] [-R]

            -p NUM  Strip NUM leading components from file names
            -i DIFF Read DIFF instead of stdin
            -R      Reverse patch

    Example:

            $ patch -p1 < example.diff
            $ patch -p0 -i example.diff

pgrep
    pgrep [-flnovx] pattern

    Display process(es) selected by regex pattern

    Options:

            -l      Show command name too
            -f      Match against entire command line
            -n      Show the newest process only
            -o      Show the oldest process only
            -v      Negate the matching
            -x      Match whole name (not substring)

pidof
    pidof [NAME...]

    List PIDs of all processes with names that match NAMEs    USAGE_PIDOF

            -s      Show only one PID
            -o PID  Omit given pid
                    Use %PPID to omit pid of pidof's parent

    Example:

            $ pidof init
            1
            $ pidof /bin/sh
            20351 5973 5950
            $ pidof /bin/sh -o %PPID
            20351 5950

ping
    ping [OPTION]... host

    Send ICMP ECHO_REQUEST packets to network hosts

    Options:

            -4, -6          Force IPv4 or IPv6 hostname resolution
            -c CNT          Send only CNT pings
            -s SIZE         Send SIZE data bytes in packets (default=56)
            -I iface/IP     Use interface or IP address as source
            -W timeout      Seconds to wait for the first response (default:10)
                            (after all -c CNT packets are sent)
            -w deadline     Seconds until ping exits (default:infinite)
                            (can exit earlier with -c CNT)
            -q              Quiet, only displays output at start
                            and when finished

    Example:

            $ ping localhost
            PING slag (127.0.0.1): 56 data bytes
            64 bytes from 127.0.0.1: icmp_seq=0 ttl=255 time=20.1 ms

            --- debian ping statistics ---
            1 packets transmitted, 1 packets received, 0% packet loss
            round-trip min/avg/max = 20.1/20.1/20.1 ms

ping6
    ping6 [OPTION]... host

    Send ICMP ECHO_REQUEST packets to network hosts

    Options:

            -c CNT          Send only CNT pings
            -s SIZE         Send SIZE data bytes in packets (default=56)
            -I iface/IP     Use interface or IP address as source
            -q              Quiet, only displays output at start
                            and when finished

    Example:

            $ ping6 ip6-localhost
            PING ip6-localhost (::1): 56 data bytes
            64 bytes from ::1: icmp6_seq=0 ttl=64 time=20.1 ms

            --- ip6-localhost ping statistics ---
            1 packets transmitted, 1 packets received, 0% packet loss
            round-trip min/avg/max = 20.1/20.1/20.1 ms

pipe_progress
    pipe_progress #define pipe_progress_full_usage

pivot_root
    pivot_root NEW_ROOT PUT_OLD

    Move the current root file system to PUT_OLD and make NEW_ROOT the new root file system

pkill
    pkill [-l] | [-fnovx] [-signal] pattern

    Send a signal to process(es) selected by regex pattern

    Options:

            -l      List all signals
            -f      Match against entire command line
            -n      Signal the newest process only
            -o      Signal the oldest process only
            -v      Negate the matching
            -x      Match whole name (not substring)

popmaildir
    popmaildir [OPTIONS] Maildir [connection-helper ...]

    Fetch content of remote mailbox to local maildir

    Options:

            -b              Binary mode. Ignored
            -d              Debug. Ignored
            -m              Show used memory. Ignored
            -V              Show version. Ignored
            -c              Use tcpclient. Ignored
            -a              Use APOP protocol. Implied. If server supports APOP -> use it
            -s              Skip authorization
            -T              Get messages with TOP instead with RETR
            -k              Keep retrieved messages on the server
            -t timeout      Set network timeout
            -F "program arg1 arg2 ..."      Filter by program. May be multiple
            -M "program arg1 arg2 ..."      Deliver by program
            -R size         Remove old messages on the server >= size (in bytes). Ignored
            -Z N1-N2        Remove messages from N1 to N2 (dangerous). Ignored
            -L size         Do not retrieve new messages >= size (in bytes). Ignored
            -H lines        Type specified number of lines of a message. Ignored

    Example:

            $ popmaildir -k ~/Maildir -- nc pop.drvv.ru 110 [<password_file]
            $ popmaildir ~/Maildir -- openssl s_client -quiet -connect pop.gmail.com:995 [<password_file]

poweroff
    poweroff [-d delay] [-n] [-f]

    Halt and shut off power

    Options:

            -d      Delay interval for halting
            -n      No call to sync()
            -f      Force power off (don't go through init)

printenv
    printenv [VARIABLES...]

    Print all or part of environment. If no environment VARIABLE specified, print them all.

printf
    printf FORMAT [ARGUMENT...]

    Format and print ARGUMENT(s) according to FORMAT, where FORMAT controls the output exactly as in C printf

    Example:

            $ printf "Val=%d\n" 5
            Val=5

ps  ps

    Report process status

            USAGE_PS
            -Z      Show SE Linux context
            w       Wide output

    Example:

            $ ps
              PID  Uid      Gid State Command
                1 root     root     S init
                2 root     root     S [kflushd]
                3 root     root     S [kupdate]
                4 root     root     S [kpiod]
                5 root     root     S [kswapd]
              742 andersen andersen S [bash]
              743 andersen andersen S -bash
              745 root     root     S [getty]
             2990 andersen andersen R ps

pscan
    pscan [-cb] [-p MIN_PORT] [-P MAX_PORT] [-t TIMEOUT] [-T MIN_RTT] HOST

    Scan a host, print all open ports

    Options:

            -c      Show closed ports too
            -b      Show blocked ports too
            -p      Scan from this port (default 1)
            -P      Scan up to this port (default 1024)
            -t      Timeout (default 5000 ms)
            -T      Minimum rtt (default 5 ms, increase for congested hosts)

pwd pwd

    Print the full filename of the current working directory

    Example:

            $ pwd
            /root

raidautorun
    raidautorun DEVICE

    Tell the kernel to automatically search and start RAID arrays

    Example:

            $ raidautorun /dev/md0

rdate
    rdate [-sp] HOST

    Get and possibly set the system date and time from a remote HOST

    Options:

            -s      Set the system date and time (default)
            -p      Print the date and time

rdev
    rdev

    Print the device node associated with the filesystem mounted at '/'

    Example:

            $ rdev
            /dev/mtdblock9 /

readahead
    readahead [FILE]...

    Preload FILE(s) in RAM cache so that subsequent reads for thosefiles do not block on disk I/O

readlink
    readlink [-f] FILE

    Display the value of a symlink

    Options:

            -f      Canonicalize by following all symlinks

readprofile
    readprofile [OPTIONS]...

    Options:

            -m mapfile      (Default: /boot/System.map)
            -p profile      (Default: /proc/profile)
            -M mult         Set the profiling multiplier to mult
            -i              Print only info about the sampling step
            -v              Verbose
            -a              Print all symbols, even if count is 0
            -b              Print individual histogram-bin counts
            -s              Print individual counters within functions
            -r              Reset all the counters (root only)
            -n              Disable byte order auto-detection

realpath
    realpath pathname...

    Return the absolute pathnames of given argument

reboot
    reboot [-d delay] [-n] [-f]

    Reboot the system

    Options:

            -d      Delay interval for rebooting
            -n      No call to sync()
            -f      Force reboot (don't go through init)

reformime
    reformime [OPTION]... [FILE]...

    Parse MIME-encoded message

    Options:

            -x prefix       Extract content of MIME sections to files
            -X prog [args]  Filter content of MIME sections through prog.
                            Must be the last option

    Other options are silently ignored.

renice
    renice {{-n INCREMENT} | PRIORITY} [[-p | -g | -u] ID...]

    Change priority of running processes

    Options:

            -n      Adjust current nice value (smaller is faster)
            -p      Process id(s) (default)
            -g      Process group id(s)
            -u      Process user name(s) and/or id(s)

reset
    reset

    Reset the screen

resize
    resize

    Resize the screen

restorecon
    restorecon [-iFnrRv] [-e excludedir]... [-o filename] [-f filename | pathname]

    Reset security contexts of files in pathname

            -i              Ignore files that do not exist
            -f file         File with list of files to process. Use - for stdin
            -e directory    Directory to exclude
            -R,-r           Recurse directories
            -n              Don't change any file labels
            -o file         Save list of files with incorrect context
            -v              Verbose
            -vv             Show changed labels
            -F              Force reset of context to match file_context
                            for customizable files, or the user section,
                            if it has changed

rm  rm [OPTION]... FILE...

    Remove (unlink) the FILE(s). Use '--' to indicate that all following arguments are non-options.

    Options:

            -i      Always prompt before removing
            -f      Never prompt
            -r,-R   Remove directories recursively

    Example:

            $ rm -rf /tmp/foo

rmdir
    rmdir [OPTION]... DIRECTORY...

    Remove the DIRECTORY, if it is empty.

    Options:

            -p|--parents    Include parents
            -ignore-fail-on-non-empty

    Example:

            # rmdir /tmp/foo

rmmod
    rmmod [OPTION]... [MODULE]...

    Unload the specified kernel modules from the kernel

    Options:

            -w      Wait until the module is no longer used
            -f      Force unloading
            -a      Remove all unused modules (recursively)

    Example:

            $ rmmod tulip

route
    route [{add|del|delete}]

    Edit kernel routing tables

    Options:

            -n      Don't resolve names
            -e      Display other/more information
            -A inet{6}      Select address family

rpm rpm -i -q[ildc]p package.rpm

    Manipulate RPM packages

    Options:

            -i      Install package
            -q      Query package
            -p      Query uninstalled package
            -i      Show information
            -l      List contents
            -d      List documents
            -c      List config files

rpm2cpio
    rpm2cpio package.rpm

    Output a cpio archive of the rpm file

rtcwake
    rtcwake [-a | -l | -u] [-d DEV] [-m MODE] [-s SEC | -t TIME]

    Enter a system sleep state until specified wakeup time

            -a,--auto       Read clock mode from adjtime
            -l,--local      Clock is set to local time
            -u,--utc        Clock is set to UTC time
            -d,--device=DEV Specify the RTC device
            -m,--mode=MODE  Set the sleep state (default: standby)
            -s,--seconds=SEC Set the timeout in SEC seconds from now
            -t,--time=TIME  Set the timeout to TIME seconds from epoch

run-parts
    run-parts [-t] [-l] [-a ARG] [-u MASK] DIRECTORY

    Run a bunch of scripts in a directory

    Options:

            -t      Print what would be run, but don't actually run anything
            -a ARG  Pass ARG as argument for every program
            -u MASK Set the umask to MASK before running every program
            -l      Print names of all matching files even if they are not executable

    Example:

            $ run-parts -a start /etc/init.d
            $ run-parts -a stop=now /etc/init.d

            Let's assume you have a script foo/dosomething:
            #!/bin/sh
            for i in $*; do eval $i; done; unset i
            case "$1" in
            start*) echo starting something;;
            stop*) set -x; shutdown -h $stop;;
            esac

            Running this yields:
            $run-parts -a stop=+4m foo/
            + shutdown -h +4m

runcon
    runcon [-c] [-u USER] [-r ROLE] [-t TYPE] [-l RANGE] COMMAND [args]
        runcon CONTEXT COMMAND [args]

    Run a program in a different security context

            CONTEXT         Complete security context

            -c,--compute    Compute process transition context before modifying
            -t,--type=TYPE  Type (for same role as parent)
            -u,--user=USER  User identity
            -r,--role=ROLE  Role
            -l,--range=RNG  Levelrange

runlevel
    runlevel [utmp]

    Example:

            $ runlevel /var/run/utmp
            N 2

runsv
    runsv dir

    Start and monitor a service and optionally an appendant log service

runsvdir
    runsvdir [-P] [-s SCRIPT] dir

    Start a runsv process for each subdirectory. If it exits, restart it.

            -P              Put each runsv in a new session
            -s SCRIPT       Run SCRIPT <signo> after signal is processed

rx  rx FILE

    Receive a file using the xmodem protocol

    Example:

            $ rx /tmp/foo

script
    script [-afq] [-c COMMAND] [OUTFILE]

    Options:

            -a      Append output
            -c      Run COMMAND, not shell
            -f      Flush output after each write
            -q      Quiet

sed sed [-efinr] pattern [files...]

    Options:

            -e script       Add the script to the commands to be executed
            -f scriptfile   Add scriptfile contents to the
                            commands to be executed
            -i              Edit files in-place
            -n              Suppress automatic printing of pattern space
            -r              Use extended regular expression syntax

    If no -e or -f is given, the first non-option argument is taken as the sed script to interpret. All remaining arguments are names of input files; if no input files are specified, then the standard input is read. Source files will not be modified unless -i option is given.

    Example:

            $ echo "foo" | sed -e 's/f[a-zA-Z]o/bar/g'
            bar

selinuxenabled
    selinuxenabled #define selinuxenabled_full_usage

sendmail
    sendmail [OPTIONS] [rcpt]...

    Send an email

    Standard options:

            -t              Read recipients from message body, add them to those on cmdline
            -f sender       Sender. REQUIRED!
            -o options      various options. -oi IMPLIED! others are IGNORED!

    Busybox specific options:

            -w seconds      Network timeout
            -H 'prog args'  Run connection helper
                            Examples:
                            -H 'exec openssl s_client -quiet -tls1 -starttls smtp
                                    -connect smtp.gmail.com:25' <email.txt
                                    [4<username_and_passwd.txt | -au<username> -ap<password>]
                            -H 'exec openssl s_client -quiet -tls1
                                    -connect smtp.gmail.com:465' <email.txt
                                    [4<username_and_passwd.txt | -au<username> -ap<password>]
            -S server[:port] Server
            -au<username>   Username for AUTH LOGIN
            -ap<password>   Password for AUTH LOGIN
            -am<method>     Authentication method. Ignored. login is implied.

    Other options are silently ignored; -oi -t is implied

seq seq [-w] [-s SEP] [FIRST [INC]] LAST

    Print numbers from FIRST to LAST, in steps of INC. FIRST, INC default to 1

    Options:

            -w      Pad to last with leading zeros
            -s SEP  String separator

sestatus
    sestatus [-vb]

            -v      Verbose
            -b      Display current state of booleans

setarch
    setarch personality program [args...]

    Personality may be:

            linux32         Set 32bit uname emulation
            linux64         Set 64bit uname emulation

setconsole
    setconsole [-r|--reset] [DEVICE]

    Redirect system console output to DEVICE (default: /dev/tty)

    Options:

            -r      Reset output to /dev/console

setenforce
    setenforce [Enforcing | Permissive | 1 | 0]

setfiles
    setfiles [-dnpqsvW] [-e dir]... [-o file] [-r alt_root_path] [-c policyfile] spec_file pathname

    Reset file contexts under pathname according to spec_file

            -c file Check the validity of the contexts against the specified binary policy
            -d      Show which specification matched each file
            -l      Log changes in file labels to syslog
            -n      Don't change any file labels
            -q      Suppress warnings
            -r dir  Use an altenate root path
            -e dir  Exclude directory
            -F      Force reset of context to match file_context for customizable files
            -o file Save list of files with incorrect context
            -s      Take a list of files from standard input (instead of command line)
            -v      Show changes in file labels, if type or role are changing
            -vv     Show changes in file labels, if type, role, or user are changing
            -W      Display warnings about entries that had no matching files

setfont
    setfont FONT [-m MAPFILE] [-C TTY]

    Load a console font

    Options:

            -m MAPFILE      Load console screen map
            -C TTY          Affect TTY instead of /dev/tty

    Example:

            $ setfont -m koi8-r /etc/i18n/fontname

setkeycodes
    setkeycodes SCANCODE KEYCODE...

    Set entries into the kernel's scancode-to-keycode map, allowing unusual keyboards to generate usable keycodes.

    SCANCODE may be either xx or e0xx (hexadecimal), and KEYCODE is given in decimal

    Example:

            $ setkeycodes e030 127

setlogcons
    setlogcons N

    Redirect the kernel output to console N (0 for current)

setsebool
    setsebool boolean value

    Change boolean setting

setsid
    setsid PROG [ARG...]

    Run PROG in a new session. PROG will have no controlling terminal and will not be affected by keyboard signals (Ctrl-C etc). See setsid(2) for details.

setuidgid
    setuidgid account prog args

    Set uid and gid to account's uid and gid, removing all supplementary groups and run PROG

sh  sh #define sh_full_usage

sha1sum
    sha1sum [OPTION] [FILEs...]
       or: sha1sum [OPTION] -c [FILE]

    Print or check SHA1 checksums.

    Options:

            -c      Check sums against given list
            -s      Don't output anything, status code shows success
            -w      Warn about improperly formatted checksum lines

sha256sum
    sha256sum [OPTION] [FILEs...]
       or: sha256sum [OPTION] -c [FILE]

    Print or check SHA1 checksums.

    Options:

            -c      Check sums against given list
            -s      Don't output anything, status code shows success
            -w      Warn about improperly formatted checksum lines

sha512sum
    sha512sum [OPTION] [FILEs...]
       or: sha512sum [OPTION] -c [FILE]

    Print or check SHA1 checksums.

    Options:

            -c      Check sums against given list
            -s      Don't output anything, status code shows success
            -w      Warn about improperly formatted checksum lines

showkey
    showkey [-a | -k | -s]

    Show keys pressed

    Options:

            -a      Display decimal/octal/hex values of the keys
            -k      Display interpreted keycodes (default)
            -s      Display raw scan-codes

slattach
    slattach [-cehmLF] [-s speed] [-p protocol] DEVICEs

    Attach network interface(s) to serial line(s)

    Options:

            -p      Set protocol (slip, cslip, slip6, clisp6 or adaptive)
            -s      Set line speed
            -e      Exit after initializing device
            -h      Exit when the carrier is lost
            -c      Execute a command when the line is hung up
            -m      Do NOT initialize the line in raw 8 bits mode
            -L      Enable 3-wire operation
            -F      Disable RTS/CTS flow control

sleep
    sleep [N]...

                     Pause for a time equal to the total of the args given, where each arg can
    have an optional suffix of (s)econds, (m)inutes, (h)ours, or (d)ays

    Example:

            $ sleep 2
            [2 second delay results]
            $ sleep 1d 3h 22m 8s
            [98528 second delay results]

softlimit
    softlimit [-a BYTES] [-m BYTES] [-d BYTES] [-s BYTES] [-l BYTES]
        [-f BYTES] [-c BYTES] [-r BYTES] [-o N] [-p N] [-t N]
        PROG ARGS

    Set soft resource limits, then run PROG

    Options:

            -a BYTES        Limit total size of all segments
            -m BYTES        Same as -d BYTES -s BYTES -l BYTES -a BYTES
            -d BYTES        Limit data segment
            -s BYTES        Limit stack segment
            -l BYTES        Limit locked memory size
            -o N            Limit number of open files per process
            -p N            Limit number of processes per uid
    Options controlling file sizes:

            -f BYTES        Limit output file sizes
            -c BYTES        Limit core file size
    Efficiency opts:

            -r BYTES        Limit resident set size
            -t N            Limit CPU time, process receives
                            a SIGXCPU after N seconds

sort
    sort [-nrugMcszbdfimSTokt] [-o FILE] [-k start[.offset][opts][,end[.offset][opts]] [-t CHAR] [FILE]...

    Sort lines of text

    Options:

            -b      Ignore leading blanks
            -c      Check whether input is sorted
            -d      Dictionary order (blank or alphanumeric only)
            -f      Ignore case
            -g      General numerical sort
            -i      Ignore unprintable characters
            -k      Sort key
            -M      Sort month
            -n      Sort numbers
            -o      Output to file
            -k      Sort by key
            -t CHAR Key separator
            -r      Reverse sort order
            -s      Stable (don't sort ties alphabetically)
            -u      Suppress duplicate lines
            -z      Lines are terminated by NUL, not newline
            -mST    Ignored for GNU compatibility

    Example:

            $ echo -e "e\nf\nb\nd\nc\na" | sort
            a
            b
            c
            d
            e
            f
            $ echo -e "c 3\nb 2\nd 2" | $SORT -k 2,2n -k 1,1r
            d 2
            b 2
            c 3

split
    split [OPTION] [INPUT [PREFIX]]

    Options:

            -b n[k|m]       Split by bytes
            -l n            Split by lines
            -a n            Use n letters as suffix

    Example:

            $ split TODO foo
            $ cat TODO | split -a 2 -l 2 TODO_

start-stop-daemon
    start-stop-daemon [OPTIONS] [-S|-K] ... [-- arguments...]

    Search for matching processes, and then -K: stop all matching processes. -S: start a process unless a matching process is found.

    Process matching:

            -u,--user USERNAME|UID  Match only this user's processes
            -n,--name NAME          Match processes with NAME
                                    in comm field in /proc/PID/stat
            -x,--exec EXECUTABLE    Match processes with this command
                                    in /proc/PID/cmdline
            -p,--pidfile FILE       Match a process with PID from the file
            All specified conditions must match
    B<-S> only:

            -x,--exec EXECUTABLE    Program to run
            -a,--startas NAME       Zeroth argument
            -b,--background         Background
            -N,--nicelevel N        Change nice level
            -c,--chuid USER[:[GRP]] Change to user/group
            -m,--make-pidfile       Write PID to the pidfile specified by -p
    B<-K> only:

            -s,--signal SIG         Signal to send
            -t,--test               Match only, exit with 0 if a process is found
    Other:

            -o,--oknodo             Exit with status 0 if nothing is done
            -v,--verbose            Verbose
            -q,--quiet              Quiet
            -c USER[:[GRP]] Change to user/group
            -m              Write PID to the pidfile specified by -p
    B<-K> only:

            -s SIG          Signal to send
            -t              Match only, exit with 0 if a process is found
    Other:

            -o              Exit with status 0 if nothing is done
            -v              Verbose
            -q              Quiet   )

stat
    stat [OPTION] FILE...

    Display file (default) or filesystem status

    Options:

            -c fmt  Use the specified format
            -f      Display filesystem status
            -L      Dereference links
            -t      Display info in terse form
            -Z      Print security context

    Valid format sequences for files:

     %a     Access rights in octal
     %A     Access rights in human readable form
     %b     Number of blocks allocated (see %B)
     %B     The size in bytes of each block reported by %b
     %d     Device number in decimal
     %D     Device number in hex
     %f     Raw mode in hex
     %F     File type
     %g     Group ID of owner
     %G     Group name of owner
     %h     Number of hard links
     %i     Inode number
     %n     File name
     %N     Quoted file name with dereference if symlink
     %o     I/O block size
     %s     Total size, in bytes
     %t     Major device type in hex
     %T     Minor device type in hex
     %u     User ID of owner
     %U     User name of owner
     %x     Time of last access
     %X     Time of last access as seconds since Epoch
     %y     Time of last modification
     %Y     Time of last modification as seconds since Epoch
     %z     Time of last change
     %Z     Time of last change as seconds since Epoch

    Valid format sequences for file systems:

     %a     Free blocks available to non-superuser
     %b     Total data blocks in file system
     %c     Total file nodes in file system
     %d     Free file nodes in file system
     %f     Free blocks in file system
     %C     Security context in SELinux
     %i     File System ID in hex
     %l     Maximum length of filenames
     %n     File name
     %s     Block size (for faster transfer)
     %S     Fundamental block size (for block counts)
     %t     Type in hex
     %T     Type in human readable form

strings
    strings [-afo] [-n length] [file...]

    Display printable strings in a binary file

    Options:

            -a      Scan whole file (default)
            -f      Precede strings with filenames
            -n N    At least N characters form a string (default 4)
            -o      Precede strings with decimal offsets

stty
    stty [-a|g] [-F DEVICE] [SETTING]...

    Without arguments, prints baud rate, line discipline, and deviations from stty sane

    Options:

            -F DEVICE       Open device instead of stdin
            -a              Print all current settings in human-readable form
            -g              Print in stty-readable form
            [SETTING]       See manpage

su  su [OPTION]... [-] [username]

    Change user id or become root

    Options:

            -p, -m  Preserve environment
            -c      Command to pass to 'sh -c'
            -s      Shell to use instead of default shell

sulogin
    sulogin [OPTION]... [tty-device]

    Single user login

    Options:

            -t      Timeout

sum sum [rs] [files...]

    Checksum and count the blocks in a file

    Options:

            -r      Use BSD sum algorithm (1K blocks)
            -s      Use System V sum algorithm (512byte blocks)

sv  sv [-v] [-w sec] command service...

    Control services monitored by runsv supervisor. Commands (only first character is enough):

    status: query service status up: if service isn't running, start it. If service stops, restart it once: like 'up', but if service stops, don't restart it down: send TERM and CONT signals. If ./run exits, start ./finish

            if it exists. After it stops, do not restart service
    exit: send TERM and CONT signals to service and log service. If they exit,

            runsv exits too
    pause, cont, hup, alarm, interrupt, quit, 1, 2, term, kill: send
    STOP, CONT, HUP, ALRM, INT, QUIT, USR1, USR2, TERM, KILL signal to service

svlogd
    svlogd [-ttv] [-r c] [-R abc] [-l len] [-b buflen] dir...

    Continuously read log data from standard input, optionally filter log messages, and write the data to one or more automatically rotated logs

swapoff
    swapoff [-a] [DEVICE]

    Stop swapping on DEVICE

    Options:

            -a      Stop swapping on all swap devices

swapon
    swapon [-a] [-p pri] [DEVICE]

    Start swapping on DEVICE

    Options:

            -a      Start swapping on all swap devices
            -p pri  Set swap device priority

switch_root
    switch_root [-c /dev/console] NEW_ROOT NEW_INIT [ARGUMENTS_TO_INIT]

    Use from PID 1 under initramfs to free initramfs, chroot to NEW_ROOT, and exec NEW_INIT

    Options:

            -c      Redirect console to device on new root

sync
    sync

    Write all buffered filesystem blocks to disk

sysctl
    sysctl [OPTIONS]... [VALUE]...

    Configure kernel parameters at runtime

    Options:

            -n      Disable printing of key names
            -e      Don't warn about unknown keys
            -w      Change sysctl setting
            -p FILE Load sysctl settings from FILE (default /etc/sysctl.conf)
            -a      Display all values
            -A      Display all values in table form

    Example:

            sysctl [-n] [-e] variable...
            sysctl [-n] [-e] -w variable=value...
            sysctl [-n] [-e] -a
            sysctl [-n] [-e] -p file        (default /etc/sysctl.conf)
            sysctl [-n] [-e] -A

syslogd
    syslogd [OPTION]...

    System logging utility. Note that this version of syslogd ignores /etc/syslog.conf.

    Options:

            -n              Run in foreground
            -O FILE         Log to given file (default=/var/log/messages)
            -l n            Set local log level
            -S              Smaller logging output
            -s SIZE         Max size (KB) before rotate (default=200KB, 0=off)
            -b NUM          Number of rotated logs to keep (default=1, max=99, 0=purge)
            -R HOST[:PORT]  Log to IP or hostname on PORT (default PORT=514/UDP)
            -L              Log locally and via network (default is network only if -R)
            -D              Drop duplicates
            -C[size(KiB)]   Log to shared mem buffer (read it using logread)        /* NB: -Csize shouldn't have space (because size is optional) */

    Example:

            $ syslogd -R masterlog:514
            $ syslogd -R 192.168.1.1:601

tac tac [FILE]...

    Concatenate FILE(s) and print them in reverse

tail
    tail [OPTION]... [FILE]...

    Print last 10 lines of each FILE to standard output. With more than one FILE, precede each with a header giving the file name. With no FILE, or when FILE is -, read standard input.

    Options:

            -c N[kbm]       Output the last N bytes
            -n N[kbm]       Print last N lines instead of last 10
            -f              Output data as the file grows
            -q              Never output headers giving file names
            -s SEC          Wait SEC seconds between reads with -f
            -v              Always output headers giving file names

    If the first character of N (bytes or lines) is a '+', output begins with the Nth item from the start of each file, otherwise, print the last N items in the file. N bytes may be suffixed by k (x1024), b (x512), or m (1024^2).

    Example:

            $ tail -n 1 /etc/resolv.conf
            nameserver 10.0.0.1

tar tar -[czjaZxtvO] [-X FILE] [-f TARFILE] [-C DIR] [FILE(s)]...

    Create, extract, or list files from a tar file

    Options:

            c       Create
            x       Extract
            t       List
    Archive format selection:

            z       Filter the archive through gzip
            j       Filter the archive through bzip2
            a       Filter the archive through lzma
            Z       Filter the archive through compress
    File selection:

            f       Name of TARFILE or "-" for stdin
            O       Extract to stdout
            exclude File to exclude
            X       File with names to exclude
            C       Change to directory DIR before operation
            v       Verbose

    Example:

            $ zcat /tmp/tarball.tar.gz | tar -xf -
            $ tar -cf /tmp/tarball.tar /usr/local

taskset
    taskset [-p] [mask] [pid | command [arg]...]

    Set or get CPU affinity

    Options:

            -p      Operate on an existing PID

    Example:

            $ taskset 0x7 ./dgemm_test&
            $ taskset -p 0x1 $!
            pid 4790's current affinity mask: 7
            pid 4790's new affinity mask: 1
            $ taskset 0x7 /bin/sh -c './taskset -p 0x1 $$'
            pid 6671's current affinity mask: 1
            pid 6671's new affinity mask: 1
            $ taskset -p 1
            pid 1's current affinity mask: 3

tc
    tc             /*"[OPTIONS] "*/"OBJECT CMD [dev STRING]

    OBJECT: {qdisc|class|filter} CMD: {add|del|change|replace|show}

    qdisc [ handle QHANDLE ] [ root | ingress | parent CLASSID ]

            /* "    [ estimator INTERVAL TIME_CONSTANT ]
    " */    [ [ QDISC_KIND ] [ help | OPTIONS ] ]

            QDISC_KIND := { [p|b]fifo | tbf | prio | cbq | red | etc. }
    qdisc show [ dev STRING ] [ingress]
    class [ classid CLASSID ] [ root | parent CLASSID ]

            [ [ QDISC_KIND ] [ help | OPTIONS ] ]
    class show [ dev STRING ] [ root | parent CLASSID ]
    filter [ pref PRIO ] [ protocol PROTO ]

            /* "    [ estimator INTERVAL TIME_CONSTANT ]
    " */    [ root | classid CLASSID ] [ handle FILTERID ]

            [ [ FILTER_TYPE ] [ help | OPTIONS ] ]
    filter show [ dev STRING ] [ root | parent CLASSID ]

tcpsvd
    tcpsvd [-hEv] [-c n] [-C n:msg] [-b n] [-u user] [-l name] ip port prog...

    Create TCP socket, bind it to ip:port and listen for incoming connection. Run PROG for each connection.

    ip    IP to listen on. '0' = all
    port    Port to listen on
    prog [arg]    Program to run
    -l name    Local hostname (else looks up local hostname in DNS)
    -u user[:group]    Change to user/group after bind
    -c n    Handle up to n connections simultaneously
    -b n    Allow a backlog of approximately n TCP SYNs
    -C n[:msg]    Allow only up to n connections from the same IP

                    New connections from this IP address are closed
                    immediately. 'msg' is written to the peer before close
    B<-h>           Look up peer's hostname
    B<-E>           Do not set up environment variables
    B<-v>           Verbose

tee tee [OPTION]... [FILE]...

    Copy standard input to each FILE, and also to standard output

    Options:

            -a      Append to the given FILEs, do not overwrite
            -i      Ignore interrupt signals (SIGINT)

    Example:

            $ echo "Hello" | tee /tmp/foo
            $ cat /tmp/foo
            Hello

telnet
    telnet HOST [PORT]

    Connect to telnet server

telnetd
    telnetd [OPTION]

    Handle incoming telnet connections

    Options:

            -l LOGIN        Exec LOGIN on connect
            -f issue_file   Display issue_file instead of /etc/issue
            -K              Close connection as soon as login exits
                            (normally wait until all programs close slave pty)
            -p PORT         Port to listen on
            -b ADDR         Address to bind to
            -F              Run in foreground
            -i              Run as inetd subservice

test
    test EXPRESSION ]

    Check file types, compare values etc. Return a 0/1 exit code depending on logical value of EXPRESSION

    Example:

            $ test 1 -eq 2
            $ echo $?
            1
            $ test 1 -eq 1
            $ echo $?
            0
            $ [ -d /etc ]
            $ echo $?
            0
            $ [ -d /junk ]
            $ echo $?
            1

tftp
    tftp [OPTION]... HOST [PORT]

    Transfer a file from/to tftp server

    Options:

            -l FILE Local FILE
            -r FILE Remote FILE
            -g      Get file
            -p      Put file
            -b SIZE Transfer blocks of SIZE octets

tftpd
    tftpd [-cr] [-u USER] [DIR]

    Transfer a file on tftp client's request.

    tftpd should be used as an inetd service. tftpd's line for inetd.conf:

            69 dgram udp nowait root tftpd tftpd /files/to/serve
    It also can be ran from udpsvd:

            udpsvd -vE 0.0.0.0 69 tftpd /files/to/serve

    Options:

            -r      Prohibit upload
            -c      Allow file creation via upload
            -u      Access files as USER

time
    time [OPTION]... COMMAND [ARGS...]

    Run the program COMMAND with arguments ARGS. When COMMAND finishes, COMMAND's resource usage information is displayed.

    Options:

            -v      Verbose

timeout
    timeout [-t SECS] [-s SIG] PROG [ARGS]

    Runs PROG. Sends SIG to it if it is not gone in SECS seconds. Defaults: SECS: 10, SIG: TERM.

top top [-b] [-nCOUNT] [-dSECONDS]

    Provide a view of process activity in real time. Read the status of all processes from /proc each SECONDS and show the status for however many processes will fit on the screen.

touch
    touch [-c] FILE [FILE...]

    Update the last-modified date on the given FILE[s]

    Options:

            -c      Do not create any files

    Example:

            $ ls -l /tmp/foo
            /bin/ls: /tmp/foo: No such file or directory
            $ touch /tmp/foo
            $ ls -l /tmp/foo
            -rw-rw-r--    1 andersen andersen        0 Apr 15 01:11 /tmp/foo

tr  tr [-cds] STRING1 [STRING2]

    Translate, squeeze, and/or delete characters from standard input, writing to standard output

    Options:

            -c      Take complement of STRING1
            -d      Delete input characters coded STRING1
            -s      Squeeze multiple output characters of STRING2 into one character

    Example:

            $ echo "gdkkn vnqkc" | tr [a-y] [b-z]
            hello world

traceroute
    traceroute [-FIldnrv] [-f 1st_ttl] [-m max_ttl] [-p port#] [-q nqueries]
        [-s src_addr] [-t tos] [-w wait] [-g gateway] [-i iface]
        [-z pausemsecs] HOST [data size]

    Trace the route to HOST

    Options:

            -F      Set the don't fragment bit
            -I      Use ICMP ECHO instead of UDP datagrams
            -l      Display the ttl value of the returned packet
            -d      Set SO_DEBUG options to socket
            -n      Print hop addresses numerically rather than symbolically
            -r      Bypass the normal routing tables and send directly to a host
            -v      Verbose
            -m max_ttl      Max time-to-live (max number of hops)
            -p port#        Base UDP port number used in probes
                            (default is 33434)
            -q nqueries     Number of probes per 'ttl' (default 3)
            -s src_addr     IP address to use as the source address
            -t tos          Type-of-service in probe packets (default 0)
            -w wait         Time in seconds to wait for a response
                            (default 3 sec)
            -g              Loose source route gateway (8 max)

true
    true

    Return an exit code of TRUE (0)

    Example:

            $ true
            $ echo $?
            0

tty tty

    Print file name of standard input's terminal

    Options:

            -s      Print nothing, only return exit status

    Example:

            $ tty
            /dev/tty2

ttysize
    ttysize [w] [h]

    Print dimension(s) of standard input's terminal, on error return 80x25

tunctl
    tunctl [-f device] ([-t name] | -d name) [-u owner] [-g group] [-b]

    Create or delete tun interfaces Options:

            -f name         tun device (/dev/net/tun)
            -t name         Create iface 'name'
            -d name         Delete iface 'name'
            -u owner        Set iface owner
            -g group        Set iface group
            -b              Brief output

    Example:

            # tunctl
            # tunctl -d tun0

tune2fs
    tune2fs [-c max-mounts-count] [-e errors-behavior] [-g group] [-i interval[d|m|w]] [-j] [-J journal-options] [-l] [-s sparse-flag] [-m reserved-blocks-percent] [-o [^]mount-options[,...]] [-r reserved-blocks-count] [-u user] [-C mount-count] [-L volume-label] [-M last-mounted-dir] [-O [^]feature[,...]] [-T last-check-time] [-U UUID] device

    Adjust filesystem options on ext[23] filesystems

udhcpc
    udhcpc [-Cfbnqtvo] [-c CID] [-V VCLS] [-H HOSTNAME] [-i INTERFACE]
        [-p pidfile] [-r IP] [-s script] [-O dhcp-option]... [-P N]

                    -V,--vendorclass=CLASSID        Vendor class identifier
            -i,--interface=INTERFACE        Interface to use (default eth0)
            -H,-h,--hostname=HOSTNAME       Client hostname
            -c,--clientid=CLIENTID  Client identifier
            -C,--clientid-none      Suppress default client identifier
            -p,--pidfile=file       Create pidfile
            -r,--request=IP         IP address to request
            -s,--script=file        Run file at DHCP events (default "CONFIG_UDHCPC_DEFAULT_SCRIPT
            -t,--retries=N          Send up to N request packets
            -T,--timeout=N          Try to get a lease for N seconds (default 3)
            -A,--tryagain=N         Wait N seconds (default 20) after failure
            -O,--request-option=OPT Request DHCP option OPT (cumulative)
            -o,--no-default-options Do not request any options (unless -O is also given)
            -f,--foreground Run in foreground
            -b,--background Background if lease is not immediately obtained
            -S,--syslog     Log to syslog too
            -n,--now        Exit with failure if lease is not immediately obtained
            -q,--quit       Quit after obtaining lease
            -R,--release    Release IP on quit
            -P,--client-port N  Use port N instead of default 68
            -a,--arping     Use arping to validate offered address  )
            -t N            Send up to N request packets
            -T N            Try to get a lease for N seconds (default 3)
            -A N            Wait N seconds (default 20) after failure
            -O OPT          Request DHCP option OPT (cumulative)
            -o              Do not request any options (unless -O is also given)
            -f              Run in foreground
            -b              Background if lease is not immediately obtained
            -S              Log to syslog too
            -n              Exit with failure if lease is not immediately obtained
            -q              Quit after obtaining lease
            -R              Release IP on quit
            -P N            Use port N instead of default 68
            -a              Use arping to validate offered address  )

udhcpd
    udhcpd [-fS] [-P N] [configfile]

    DHCP server

            -f      Run in foreground
            -S      Log to syslog too
            -P N    Use port N instead of default 67

udpsvd
    udpsvd [-hEv] [-c n] [-u user] [-l name] ip port prog

    Create UDP socket, bind it to ip:port and wait for incoming packets. Run PROG for each packet, redirecting all further packets with same peer ip:port to it

    ip    IP to listen on. '0' = all
    port    Port to listen on
    prog [arg]    Program to run
    -l name    Local hostname (else looks up local hostname in DNS)
    -u user[:group]    Change to user/group after bind
    -c n    Handle up to n connections simultaneously
    -h    Look up peer's hostname
    -E    Do not set up environment variables
    -v    Verbose

umount
    umount [flags] FILESYSTEM|DIRECTORY

    Unmount file systems

    Options:

            -a      Unmount all file systems in /etc/mtab
            -n      Don't erase /etc/mtab entries
            -r      Try to remount devices as read-only if mount is busy
            -l      Lazy umount (detach filesystem)
            -f      Force umount (i.e., unreachable NFS server)
            -d      Free loop device if it has been used

    Example:

            $ umount /dev/hdc1

uname
    uname [-amnrspv]

    Print system information.

    Options:

            -a      Print all
            -m      The machine (hardware) type
            -n      Hostname
            -r      OS release
            -s      OS name (default)
            -p      Processor type
            -v      OS version

    Example:

            $ uname -a
            Linux debian 2.4.23 #2 Tue Dec 23 17:09:10 MST 2003 i686 GNU/Linux

uncompress
    uncompress [-c] [-f] [name...]

    Uncompress .Z file[s]

    Options:

            -c      Extract to stdout
            -f      Overwrite an existing file

unexpand
    unexpand [-f][-a][-t NUM] [FILE|-]

    Convert spaces to tabs, writing to standard output.

    Options:

            -a,--all        Convert all blanks
            -f,--first-only Convert only leading blanks
            -t,--tabs=N     Tabstops every N chars

uniq
    uniq [-fscduw]... [INPUT [OUTPUT]]

    Discard duplicate lines

    Options:

            -c      Prefix lines by the number of occurrences
            -d      Only print duplicate lines
            -u      Only print unique lines
            -f N    Skip first N fields
            -s N    Skip first N chars (after any skipped fields)
            -w N    Compare N characters in line

    Example:

            $ echo -e "a\na\nb\nc\nc\na" | sort | uniq
            a
            b
            c

unix2dos
    unix2dos [option] [FILE]

    Convert FILE from unix to dos format. When no file is given, use stdin/stdout.

    Options:

            -u      dos2unix
            -d      unix2dos

unlzma
    unlzma [OPTION]... [FILE]

    Uncompress FILE (or standard input if FILE is '-' or omitted)

    Options:

            -c      Write to standard output
            -f      Force

unzip
    unzip [-opts[modifiers]] file[.zip] [list] [-x xlist] [-d exdir]

    Extract files from ZIP archives

    Options:

            -l      List archive contents (with -q for short form)
            -n      Never overwrite existing files (default)
            -o      Overwrite files without prompting
            -p      Send output to stdout
            -q      Quiet
            -x      Exclude these files
            -d      Extract files into this directory

uptime
    uptime

    Display the time since the last boot

    Example:

            $ uptime
              1:55pm  up  2:30, load average: 0.09, 0.04, 0.00

usleep
    usleep N

    Pause for N microseconds

    Example:

            $ usleep 1000000
            [pauses for 1 second]

uudecode
    uudecode [-o outfile] [infile]

    Uudecode a file Finds outfile name in uuencoded source unless -o is given

    Example:

            $ uudecode -o busybox busybox.uu
            $ ls -l busybox
            -rwxr-xr-x   1 ams      ams        245264 Jun  7 21:35 busybox

uuencode
    uuencode [-m] [infile] stored_filename

    Uuencode a file to stdout

    Options:

            -m      Use base64 encoding per RFC1521

    Example:

            $ uuencode busybox busybox
            begin 755 busybox
            <encoded file snipped>
            $ uudecode busybox busybox > busybox.uu
            $

vconfig
    vconfig COMMAND [OPTIONS]...

    Create and remove virtual ethernet devices

    Options:

            add             [interface-name] [vlan_id]
            rem             [vlan-name]
            set_flag        [interface-name] [flag-num] [0 | 1]
            set_egress_map  [vlan-name] [skb_priority] [vlan_qos]
            set_ingress_map [vlan-name] [skb_priority] [vlan_qos]
            set_name_type   [name-type]

vi  vi [OPTION] [FILE]...

    Edit FILE

    Options:

            -c      Initial command to run ($EXINIT also available)
            -R      Read-only - do not write to the file
            -H      Short help regarding available features

vlock
    vlock [OPTIONS]

    Lock a virtual terminal. A password is required to unlock.

    Options:

            -a      Lock all VTs

watch
    watch [-n seconds] [-t] COMMAND...

    Execute a program periodically

    Options:

            -n      Loop period in seconds (default 2)
            -t      Don't print header

    Example:

            $ watch date
            Mon Dec 17 10:31:40 GMT 2000
            Mon Dec 17 10:31:42 GMT 2000
            Mon Dec 17 10:31:44 GMT 2000

watchdog
    watchdog [-t N[ms]] [-T N[ms]] [-F] DEV

    Periodically write to watchdog device DEV

    Options:

            -T N    Reboot after N seconds if not reset (default 60)
            -t N    Reset every N seconds (default 30)
            -F      Run in foreground

    Use 500ms to specify period in milliseconds

wc  wc [OPTION]... [FILE]...

    Print line, word, and byte counts for each FILE, and a total line if more than one FILE is specified. With no FILE, read standard input.

    Options:

            -c      Print the byte counts
            -l      Print the newline counts
            -L      Print the length of the longest line
            -w      Print the word counts

    Example:

            $ wc /etc/passwd
                 31      46    1365 /etc/passwd

wget
    wget            [-c|--continue] [-s|--spider] [-q|--quiet] [-O|--output-document file]
        [--header 'header: value'] [-Y|--proxy on/off] [-P DIR]
        [-U|--user-agent agent] url

    Retrieve files via HTTP or FTP

    Options:

            -s      Spider mode - only check file existence
            -c      Continue retrieval of aborted transfer
            -q      Quiet
            -P      Set directory prefix to DIR
            -O      Save to filename ('-' for stdout)
            -U      Adjust 'User-Agent' field
            -Y      Use proxy ('on' or 'off')

which
    which [COMMAND...]

    Locate a COMMAND

    Example:

            $ which login
            /bin/login

who who [-a]

    Show who is logged on

    Options:

            -a      show all

whoami
    whoami

    Print the user name associated with the current effective user id

xargs
    xargs [OPTIONS] [COMMAND] [ARGS...]

    Execute COMMAND on every item given by standard input

    Options:

            -p      Ask user whether to run each command
            -r      Do not run command if input is empty
            -0      Input is separated by NUL characters
            -t      Print the command on stderr before execution
            -e[STR] STR stops input processing
            -n N    Pass no more than N args to COMMAND
            -s N    Pass command line of no more than N bytes
            -x      Exit if size is exceeded

    Example:

            $ ls | xargs gzip
            $ find . -name '*.c' -print | xargs rm

yes yes [OPTION]... [STRING]...

    Repeatedly output a line with all specified STRING(s), or 'y'

zcat
    zcat FILE

    Uncompress to stdout

zcip
    zcip [OPTIONS] ifname script

    Manage a ZeroConf IPv4 link-local address

    Options:

            -f              Run in foreground
            -q              Quit after obtaining address
            -r 169.254.x.x  Request this address first
            -v              Verbose

    With no -q, runs continuously monitoring for ARP conflicts, exits only on I/O errors (link down etc)

LIBC NSS
GNU Libc (glibc) uses the Name Service Switch (NSS) to configure the behavior of the C library for the local environment, and to configure how it reads system data, such as passwords and group information. This is implemented using an /etc/nsswitch.conf configuration file, and using one or more of the /lib/libnss_* libraries. BusyBox tries to avoid using any libc calls that make use of NSS. Some applets however, such as login and su, will use libc functions that require NSS.

If you enable CONFIG_USE_BB_PWD_GRP, BusyBox will use internal functions to directly access the /etc/passwd, /etc/group, and /etc/shadow files without using NSS. This may allow you to run your system without the need for installing any of the NSS configuration files and libraries.

When used with glibc, the BusyBox 'networking' applets will similarly require that you install at least some of the glibc NSS stuff (in particular, /etc/nsswitch.conf, /lib/libnss_dns*, /lib/libnss_files*, and /lib/libresolv*).

Shameless Plug: As an alternative, one could use a C library such as uClibc. In addition to making your system significantly smaller, uClibc does not require the use of any NSS support files or libraries.

MAINTAINER
Denis Vlasenko <vda.linux@googlemail.com>

AUTHORS
The following people have contributed code to BusyBox whether they know it or not. If you have written code included in BusyBox, you should probably be listed here so you can obtain your bit of eternal glory. If you should be listed here, or the description of what you have done needs more detail, or is incorect, please send in an update.

Emanuele Aina <emanuele.aina@tiscali.it>
    run-parts

Erik Andersen <andersen@codepoet.org>

    Tons of new stuff, major rewrite of most of the
    core apps, tons of new apps as noted in header files.
    Lots of tedious effort writing these boring docs that
    nobody is going to actually read.

Laurence Anderson <l.d.anderson@warwick.ac.uk>

    rpm2cpio, unzip, get_header_cpio, read_gz interface, rpm

Jeff Angielski <jeff@theptrgroup.com>

    ftpput, ftpget

Edward Betts <edward@debian.org>

    expr, hostid, logname, whoami

John Beppu <beppu@codepoet.org>

    du, nslookup, sort

Brian Candler <B.Candler@pobox.com>

    tiny-ls(ls)

Randolph Chung <tausq@debian.org>

    fbset, ping, hostname

Dave Cinege <dcinege@psychosis.com>

    more(v2), makedevs, dutmp, modularization, auto links file,
    various fixes, Linux Router Project maintenance

Jordan Crouse <jordan@cosmicpenguin.net>

        ipcalc

Magnus Damm <damm@opensource.se>

    tftp client insmod powerpc support

Larry Doolittle <ldoolitt@recycle.lbl.gov>

    pristine source directory compilation, lots of patches and fixes.

Glenn Engel <glenne@engel.org>

    httpd

Gennady Feldman <gfeldman@gena01.com>

    Sysklogd (single threaded syslogd, IPC Circular buffer support,
    logread), various fixes.

Karl M. Hegbloom <karlheg@debian.org>

    cp_mv.c, the test suite, various fixes to utility.c, &c.

Daniel Jacobowitz <dan@debian.org>

    mktemp.c

Matt Kraai <kraai@alumni.cmu.edu>

    documentation, bugfixes, test suite

Stephan Linz <linz@li-pro.net>

        ipcalc, Red Hat equivalence

John Lombardo <john@deltanet.com>

    tr

Glenn McGrath <bug1@iinet.net.au>

    Common unarchving code and unarchiving applets, ifupdown, ftpgetput,
    nameif, sed, patch, fold, install, uudecode.
    Various bugfixes, review and apply numerous patches.

Manuel Novoa III <mjn3@codepoet.org>

    cat, head, mkfifo, mknod, rmdir, sleep, tee, tty, uniq, usleep, wc, yes,
    mesg, vconfig, make_directory, parse_mode, dirname, mode_string,
    get_last_path_component, simplify_path, and a number trivial libbb routines

    also bug fixes, partial rewrites, and size optimizations in
    ash, basename, cal, cmp, cp, df, du, echo, env, ln, logname, md5sum, mkdir,
    mv, realpath, rm, sort, tail, touch, uname, watch, arith, human_readable,
    interface, dutmp, ifconfig, route

Vladimir Oleynik <dzo@simtreas.ru>

    cmdedit; xargs(current), httpd(current);
    ports: ash, crond, fdisk, inetd, stty, traceroute, top;
    locale, various fixes
    and irreconcilable critic of everything not perfect.

Bruce Perens <bruce@pixar.com>

    Original author of BusyBox in 1995, 1996. Some of his code can
    still be found hiding here and there...

Tim Riker <Tim@Rikers.org>

    bug fixes, member of fan club

Kent Robotti <robotti@metconnect.com>

    reset, tons and tons of bug reports and patches.

Chip Rosenthal <chip@unicom.com>, <crosenth@covad.com>

    wget - Contributed by permission of Covad Communications

Pavel Roskin <proski@gnu.org>

    Lots of bugs fixes and patches.

Gyepi Sam <gyepi@praxis-sw.com>

    Remote logging feature for syslogd

Linus Torvalds <torvalds@transmeta.com>

    mkswap, fsck.minix, mkfs.minix

Mark Whitley <markw@codepoet.org>

    grep, sed, cut, xargs(previous),
    style-guide, new-applet-HOWTO, bug fixes, etc.

Charles P. Wright <cpwright@villagenet.com>

    gzip, mini-netcat(nc)

Enrique Zanardi <ezanardi@ull.es>

    tarcat (since removed), loadkmap, various fixes, Debian maintenance

Tito Ragusa <farmatito@tiscali.it>

        devfsd and size optimizations in strings, openvt and deallocvt.