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:

            add-shell, arp, arping, ash, cat, chattr, chmod, cp, date, depmod,
            df, dhcprelay, dmesg, dumpleases, echo, egrep, expr, fgrep, find,
            fsck, getty, grep, halt, hush, ifconfig, init, insmod, kill,
            killall, klogd, linuxrc, logger, login, logread, ls, lsattr, lsmod,
            mkdir, modinfo, modprobe, mount, msh, netstat, passwd, ping,
            poweroff, ps, reboot, rm, rmmod, route, sed, sh, sleep, syslogd,
            telnet, telnetd, tftp, tftpd, udhcpc, udhcpd, umount, vconfig, wget,
            xargs

COMMAND DESCRIPTIONS
    add-shell
        add-shell SHELL...

        Add SHELLs to /etc/shells

    arp arp [-vn] [-H HWTYPE] [-i IF] -a [HOSTNAME] [-v] [-i IF] -d HOSTNAME
        [pub] [-v] [-H HWTYPE] [-i IF] -s HOSTNAME HWADDR [temp] [-v] [-H
        HWTYPE] [-i IF] -s HOSTNAME HWADDR [netmask MASK] pub [-v] [-H
        HWTYPE] [-i IF] -Ds HOSTNAME IFACE [netmask MASK] pub

        Manipulate ARP cache

                -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 CNT] [-w TIMEOUT] [-I IFACE] [-s SRC_IP] DST_IP

        Send ARP requests/replies

                -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, seconds
                -I IFACE        Interface to use (default eth0)
                -s SRC_IP       Sender IP address
                DST_IP          Target IP address

    ash ash [-/+OPTIONS] [-/+o OPT]... [-c 'SCRIPT' [ARG0 [ARGS]] / FILE
        [ARGS]]

        Unix shell interpreter

    cat cat [FILE]...

        Concatenate FILEs and print them to stdout

    chattr
        chattr [-R] [-+=AacDdijsStTu] [-v VERSION] [FILE]...

        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       Don't 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
                -R      Recurse
                -v      Set the file's version/generation number

    chmod
        chmod [-R] 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

                -R      Recurse

    cp  cp [OPTIONS] SOURCE DEST

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

                -a      Same as -dpR
                -R,-r   Recurse
                -d,-P   Preserve symlinks (default if -R)
                -L      Follow all symlinks
                -H      Follow symlinks on command line
                -p      Preserve file attributes if possible
                -f      Overwrite
                -i      Prompt before overwrite
                -l,-s   Create (sym)links

    date
        date [OPTIONS] [+FMT] [TIME]

        Display time (using +FMT), or set time

                [-s] TIME       Set time to TIME
                -u              Work in UTC (don't convert to local time)
                -R              Output RFC-2822 compliant date string
                -r FILE         Display last modification time of FILE
                -d TIME         Display TIME, not 'now'

        Recognized TIME formats:

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

    df  df [-Pk] [FILESYSTEM]...

        Print filesystem usage statistics

                -P      POSIX output format
                -k      1024-byte blocks (default)

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

        Relay DHCP requests between clients and server

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

        Print or control the kernel ring buffer

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

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

        Display DHCP leases granted by udhcpd

                -f FILE Lease file
                -r      Show remaining time
                -a      Show expiration time

    echo
        echo [ARG]...

        Print the specified ARGs to stdout

    expr
        expr EXPRESSION

        Print the value of EXPRESSION to stdout

        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.

    find
        find [PATH]... [OPTIONS] [ACTIONS]

        Search for files and perform actions on them. First failed action
        stops processing of current file. Defaults: PATH is current
        directory, action is '-print'

                -follow         Follow symlinks
                -xdev           Don't descend directories on other filesystems
                -maxdepth N     Descend at most N levels. -maxdepth 0 applies
                                actions to command line arguments only
                -mindepth N     Don't act on first N levels
                -depth          Act on directory *after* traversing it

        Actions:

                ( ACTIONS )     Group actions for -o / -a
                ! ACT           Invert ACT's success/failure
                ACT1 [-a] ACT2  If ACT1 fails, stop, else do ACT2
                ACT1 -o ACT2    If ACT1 succeeds, stop, else do ACT2
                                Note: -a has higher priority than -o
                -name PATTERN   Match file name (w/o directory name) to PATTERN
                -iname PATTERN  Case insensitive -name
                -path PATTERN   Match path to PATTERN
                -ipath PATTERN  Case insensitive -path
                -regex PATTERN  Match path to regex PATTERN
                -type X         File type is X (one of: f,d,l,b,c,...)
                -perm MASK      At least one mask bit (+MASK), all bits (-MASK),
                                or exactly MASK bits are set in file's mode
                -mtime DAYS     mtime is greater than (+N), less than (-N),
                                or exactly N days in the past
                -mmin MINS      mtime is greater than (+N), less than (-N),
                                or exactly N minutes in the past
                -newer FILE     mtime is more recent than FILE's
                -inum N         File has inode number N
                -user NAME/ID   File is owned by given user
                -group NAME/ID  File is owned by given group
                -size N[bck]    File size is N (c:bytes,k:kbytes,b:512 bytes(def.))
                                +/-N: file size is bigger/smaller than N
                -links N        Number of links is greater than (+N), less than (-N),
                                or exactly N
                -prune          If current file is directory, don't descend into it
        If none of the following actions is specified, -print is assumed
                -print          Print file name
                -print0         Print file name, NUL terminated
                -exec CMD ARG ; Run CMD with all instances of {} replaced by
                                file name. Fails if CMD exits with nonzero
                -delete         Delete current file/directory. Turns on -depth option

    fsck
        fsck [-ANPRTV] [-C FD] [-t FSTYPE] [FS_OPTS] [BLOCKDEV]...

        Check and repair filesystems

                -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

    getty
        getty [OPTIONS] BAUD_RATE[,BAUD_RATE]... TTY [TERMTYPE]

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

                -h              Enable hardware RTS/CTS flow control
                -L              Set CLOCAL (ignore Carrier Detect state)
                -m              Get baud rate from modem's CONNECT status message
                -n              Don't prompt for login name
                -w              Wait for CR or LF before sending /etc/issue
                -i              Don't display /etc/issue
                -f ISSUE_FILE   Display ISSUE_FILE instead of /etc/issue
                -l LOGIN        Invoke LOGIN instead of /bin/login
                -t SEC          Terminate after SEC if no login name is read
                -I INITSTR      Send INITSTR before anything else
                -H HOST         Log HOST into the utmp file as the hostname

        BAUD_RATE of 0 leaves it unchanged

    grep
        grep [-HhnlLoqvsriwFE] [-m N] [-A/B/C N] PATTERN/-e PATTERN.../-f
        FILE [FILE]...

        Search for PATTERN in FILEs (or stdin)

                -H      Add 'filename:' prefix
                -h      Do not add 'filename:' prefix
                -n      Add 'line_no:' prefix
                -l      Show only names of files that match
                -L      Show only names of files that don't match
                -c      Show only count of matching lines
                -o      Show only the matching part of line
                -q      Quiet. Return 0 if PATTERN is found, 1 otherwise
                -v      Select non-matching lines
                -s      Suppress open and read errors
                -r      Recurse
                -i      Ignore case
                -w      Match whole words only
                -F      PATTERN is a literal (not regexp)
                -E      PATTERN is an extended regexp
                -m N    Match up to N times per file
                -A N    Print N lines of trailing context
                -B N    Print N lines of leading context
                -C N    Same as '-A N -B N'
                -e PTRN Pattern to match
                -f FILE Read pattern from file

    halt
        halt [-d DELAY] [-n] [-f]

        Halt the system

                -d SEC  Delay interval
                -n      Do not sync
                -f      Force (don't go through init)

    hush
        hush [-nxl] [-c 'SCRIPT' [ARG0 [ARGS]] / FILE [ARGS]]

        Unix shell interpreter

    ifconfig
        ifconfig [-a] interface [address]

        Configure a network interface

                [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] ...

    init
        init

        Init is the parent of all processes

    insmod
        insmod FILE [SYMBOL=VALUE]...

        Load the specified kernel modules into the kernel

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

        Send a signal (default: TERM) to given PIDs

                -l      List all signal names and numbers

    killall
        killall [-l] [-q] [-SIG] PROCESS_NAME...

        Send a signal (default: TERM) to given processes

                -l      List all signal names and numbers
                -q      Don't complain if no processes were killed

    klogd
        klogd [-c N] [-n]

        Kernel logger

                -c N    Print to console messages more urgent than prio N (1-8)
                -n      Run in foreground

    logger
        logger [OPTIONS] [MESSAGE]

        Write MESSAGE (or stdin) to syslog

                -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)

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

        Begin a new session on the system

                -f      Don't authenticate (user already authenticated)
                -h      Name of the remote host
                -p      Preserve environment

    logread
        logread [-f]

        Show messages in syslogd's circular buffer

                -f      Output data as log grows

    ls  ls [-1AaCxdLHlinserSXvctu] [-w WIDTH] [FILE]...

        List directory contents

                -1      One column output
                -a      Include entries which start with .
                -A      Like -a, but exclude . and ..
                -C      List by columns
                -x      List by lines
                -d      List directory entries instead of contents
                -L      Follow symlinks
                -H      Follow symlinks on command line
                -l      Long listing format
                -i      List inode numbers
                -n      List numeric UIDs and GIDs instead of names
                -s      List allocated blocks
                -e      List full date and time
                -r      Sort in reverse order
                -S      Sort by size
                -X      Sort by extension
                -v      Sort by version
                -c      With -l: sort by ctime
                -t      With -l: sort by mtime
                -u      With -l: sort by atime
                -w N    Assume the terminal is N columns wide

    lsattr
        lsattr [-Radlv] [FILE]...

        List file attributes on an ext2 fs

                -R      Recurse
                -a      Don't 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

    mkdir
        mkdir [OPTIONS] DIRECTORY...

        Create DIRECTORY

                -m MODE Mode
                -p      No error if exists; make parent directories as needed

    modinfo
        modinfo [-adlp0] [-F keyword] MODULE

                -a              Shortcut for '-F author'
                -d              Shortcut for '-F description'
                -l              Shortcut for '-F license'
                -p              Shortcut for '-F parm'
                -F keyword      Keyword to look for
                -0              Separate output with NULs

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

                -a      Load multiple MODULEs
                -l      List (MODULE is a pattern)
                -r      Remove MODULE (stacks) or do autoclean
                -q      Quiet
                -v      Verbose
                -s      Log to syslog
                -D      Show dependencies
                -b      Apply blacklist to module names too

    mount
        mount [OPTIONS] [-o OPTS] DEVICE NODE

        Mount a filesystem. Filesystem autodetection requires /proc.

                -a              Mount all filesystems in fstab
                -r              Read-only mount
                -w              Read-write mount (default)
                -t FSTYPE       Filesystem type
                -O OPT          Mount only filesystems with option OPT (-a only)
        -o OPT:
                remount         Remount a mounted filesystem, changing flags
                ro/rw           Same as -r/-w

        There are filesystem-specific -o flags.

    msh msh [-nxl] [-c 'SCRIPT' [ARG0 [ARGS]] / FILE [ARGS]]

        Unix shell interpreter

    netstat
        netstat [-ral] [-tuwx] [-enWp]

        Display networking information

                -r      Routing table
                -a      All sockets
                -l      Listening sockets
                        Else: connected sockets
                -t      TCP sockets
                -u      UDP sockets
                -w      Raw sockets
                -x      Unix sockets
                        Else: all socket types
                -e      Other/more information
                -n      Don't resolve names
                -W      Wide display
                -p      Show PID/program name for sockets

    passwd
        passwd [OPTIONS] [USER]

        Change USER's password (default: current user)

                -a ALG  Encryption method
                -d      Set password to ''
                -l      Lock (disable) account
                -u      Unlock (enable) account

    ping
        ping [OPTIONS] HOST

        Send ICMP ECHO_REQUEST packets to network hosts

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

    poweroff
        poweroff [-d DELAY] [-n] [-f]

        Halt and shut off power

                -d SEC  Delay interval
                -n      Do not sync
                -f      Force (don't go through init)

    ps  ps

        Show list of processes

                w       Wide output

    reboot
        reboot [-d DELAY] [-n] [-f]

        Reboot the system

                -d SEC  Delay interval
                -n      Do not sync
                -f      Force (don't go through init)

    rm  rm [-irf] FILE...

        Remove (unlink) FILEs

                -i      Always prompt before removing
                -f      Never prompt
                -R,-r   Recurse

    rmmod
        rmmod [-wfa] [MODULE]...

        Unload kernel modules

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

    route
        route [{add|del|delete}]

        Edit kernel routing tables

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

    sed sed [-efinr] SED_CMD [FILE]...

                -e CMD  Add CMD to sed commands to be executed
                -f FILE Add FILE contents to sed commands to be executed
                -i      Edit files in-place (else sends result to stdout)
                -n      Suppress automatic printing of pattern space
                -r      Use extended regex syntax

        If no -e or -f, the first non-option argument is the sed command
        string. Remaining arguments are input files (stdin if none).

    sh  sh [-/+OPTIONS] [-/+o OPT]... [-c 'SCRIPT' [ARG0 [ARGS]] / FILE
        [ARGS]]

        Unix shell interpreter

    sleep
        sleep N

        Pause for N seconds

    syslogd
        syslogd [OPTIONS]

        System logging utility (this version of syslogd ignores
        /etc/syslog.conf)

                -n              Run in foreground
                -O FILE         Log to FILE (default:/var/log/messages)
                -l N            Log only messages more urgent than prio N (1-8)
                -S              Smaller output
                -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)
                -C[size_kb]     Log to shared mem buffer (use logread to read it)

    telnet
        telnet [-a] [-l USER] HOST [PORT]

        Connect to telnet server

                -a      Automatic login with $USER variable
                -l USER Automatic login as USER

    telnetd
        telnetd [OPTIONS]

        Handle incoming telnet connections

                -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[:PORT]  Address to bind to
                -F              Run in foreground
                -i              Inetd mode
                -w SEC          Inetd 'wait' mode, linger time SEC
                -S              Log to syslog (implied by -i or without -F and -w)

    tftp
        tftp [OPTIONS] HOST [PORT]

        Transfer a file from/to tftp server

                -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 -l /files/to/serve
        It also can be ran from udpsvd:

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

                -r      Prohibit upload
                -c      Allow file creation via upload
                -u      Access files as USER
                -l      Log to syslog (inetd mode requires this)

    udhcpc
        udhcpc [-fbnqvoCRB] [-i IFACE] [-r IP] [-s PROG] [-p PIDFILE] [-H
        HOSTNAME] [-V VENDOR] [-x OPT:VAL]... [-O OPT]...

                -i IFACE        Interface to use (default eth0)
                -p FILE         Create pidfile
                -s PROG         Run PROG at DHCP events (default /usr/share/udhcpc/default.script)
                -B              Request broadcast replies
                -t N            Send up to N discover packets
                -T N            Pause between packets (default 3 seconds)
                -A N            Wait N seconds (default 20) after failure
                -f              Run in foreground
                -b              Background if lease is not obtained
                -n              Exit if lease is not obtained
                -q              Exit after obtaining lease
                -R              Release IP on exit
                -S              Log to syslog too
                -a              Use arping to validate offered address
                -O OPT          Request option OPT from server (cumulative)
                -o              Don't request any options (unless -O is given)
                -r IP           Request this IP address
                -x OPT:VAL      Include option OPT in sent packets (cumulative)
                                Examples of string, numeric, and hex byte opts:
                                -x hostname:bbox - option 12
                                -x lease:3600 - option 51 (lease time)
                                -x 0x3d:0100BEEFC0FFEE - option 61 (client id)
                -F NAME         Ask server to update DNS mapping for NAME
                -H,-h NAME      Send NAME as client hostname (default none)
                -V VENDOR       Vendor identifier (default 'udhcp VERSION')
                -C              Don't send MAC as client identifier
                -v              Verbose
        Signals:

                USR1    Renew current lease
                USR2    Release current lease

    udhcpd
        udhcpd [-fS] [CONFFILE]

        DHCP server

                -f      Run in foreground
                -S      Log to syslog too

    umount
        umount [OPTIONS] FILESYSTEM|DIRECTORY

        Unmount file systems

                -a      Unmount all file systems
                -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)

    vconfig
        vconfig COMMAND [OPTIONS]

        Create and remove virtual ethernet devices

                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]

    wget
        wget [-csq] [-O FILE] [-Y on/off] [-P DIR] [-U AGENT] [-T SEC]
        URL...

        Retrieve files via HTTP or FTP

                -s      Spider mode - only check file existence
                -c      Continue retrieval of aborted transfer
                -q      Quiet
                -P DIR  Save to DIR (default .)
                -T SEC  Network read timeout is SEC seconds
                -O FILE Save to FILE ('-' for stdout)
                -U STR  Use STR for User-Agent header
                -Y      Use proxy ('on' or 'off')

    xargs
        xargs [OPTIONS] [PROG ARGS]

        Run PROG on every item given by stdin

                -p      Ask user whether to run each command
                -r      Don't 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 PROG
                -s N    Pass command line of no more than N bytes
                -x      Exit if size is exceeded

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 incorrect, 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 unarchiving 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.

    Paul Fox <pgf@foxharp.boston.ma.us>

        vi editing mode for ash, various other patches/fixes

    Roberto A. Foglietta <me@roberto.foglietta.name>

        port: dnsd

    Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

        misc

    Mike Frysinger <vapier@gentoo.org>

        initial e2fsprogs, printenv, setarch, sum, misc

    Jie Zhang <jie.zhang@analog.com>

        fixed two bugs in msh and hush (exitcode of killed processes)

