root@coyote # busybox
BusyBox v1.13.2 (2010-02-24 16:04:14 EST) multi-call binary
Copyright (C) 1998-2008 Erik Andersen, Rob Landley, Denys Vlasenko and
others. Licensed under GPLv2.
See source distribution for full notice.

Usage: busybox [function] [arguments]...
   or: function [arguments]...

    BusyBox is a multi-call binary that combines many common Unix
    utilities into a single executable.  Most people will create a link
    to busybox for each function they wish to use and BusyBox will act
    like whatever it was invoked as!

Currently defined functions:
    [, [[, addgroup, adduser, ar, ash, awk, basename, blkid, bunzip2,
    bzcat, cat, chattr, chgrp, chmod, chown, chpasswd, chroot, chvt,
    clear, cmp, cp, cpio, cryptpw, cut, date, dc, dd, deallocvt,
    delgroup, deluser, df, dhcprelay, diff, dirname, dmesg, du,
    dumpkmap, dumpleases, echo, egrep, env, expr, false, fbset,
    fbsplash, fdisk, fgrep, find, free, freeramdisk, fsck, fsck.minix,
    fuser, getopt, getty, grep, gunzip, gzip, halt, head, hexdump,
    hostname, httpd, hwclock, id, ifconfig, ifdown, ifup, init, insmod,
    ip, kill, killall, klogd, last, less, linuxrc, ln, loadfont,
    loadkmap, logger, login, logname, logread, losetup, ls, lsmod,
    makedevs, md5sum, mdev, microcom, mkdir, mkfifo, mkfs.minix, mknod,
    mkswap, mktemp, modprobe, more, mount, mv, nc, netstat, nice,
    nohup, nslookup, od, openvt, passwd, patch, pidof, ping, ping6,
    pivot_root, poweroff, printf, ps, pwd, rdate, rdev, readahead,
    readlink, readprofile, realpath, reboot, renice, reset, rm, rmdir,
    rmmod, route, rtcwake, run-parts, sed, seq, setconsole, setfont,
    sh, showkey, sleep, sort, start-stop-daemon, strings, stty, su,
    sulogin, swapoff, swapon, switch_root, sync, sysctl, syslogd, tail,
    tar, tee, telnet, telnetd, test, tftp, time, top, touch, tr,
    traceroute, true, tty, udhcpc, udhcpd, umount, uname, uniq, unzip,
    uptime, usleep, vi, vlock, watch, wc, wget, which, who, whoami,
    xargs, yes, zcat