Factory:Firmware:Busybox

/ #  busybox
BusyBox v1.1.3 (2009.11.23-11:29+0000) multi-call binary

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, ash, basename, busybox, cat, chmod, chown, chroot, clear, cp, cut, date, dd, delgroup, deluser, devfsd, df, dirname,
        dmesg, du, e2fsck, echo, egrep, eject, expr, false, fdisk, fgrep, find, free, fsck, fsck.ext2, fsck.ext3, ftpget, ftpput, getopt, grep, halt,
        head, hexdump, hostname, httpd, hwclock, id, ifconfig, inetd, init, insmod, ipcrm, ipcs, kill, killall, klogd, linuxrc, ln, logger, login,
        losetup, ls, lsmod, lzmacat, mkdir, mke2fs, mkfs.ext2, mkfs.ext3, mkfs.extk, mknod, mkswap, mktemp, modprobe, more, mount, mv, netstat, nice,
        passwd, pidof, ping, pivot_root, poweroff, printf, ps, pwd, readlink, reboot, rm, rmdir, rmmod, route, sed, sh, sleep, sort, stty, swapoff,
        swapon, sync, syslogd, tail, tar, tee, telnetd, test, tftp, time, touch, tr, true, tune2fs, udhcpc, udhcpd, umount, uname, unlzma, unzip, uptime,
        usleep, vi, wc, wget, which, yes