$ ./busybox-mipsel
BusyBox v1.21.1 (2013-07-08 11:09:23 CDT) multi-call binary.
BusyBox is copyrighted by many authors between 1998-2012.
Licensed under GPLv2. See source distribution for detailed
copyright notices.

Usage: busybox [function [arguments]...]
   or: busybox --list[-full]
   or: busybox --install [-s] [DIR]
   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:
        [, [[, acpid, add-shell, addgroup, adduser, adjtimex, arp, arping, ash,
        awk, base64, basename, beep, blkid, blockdev, bootchartd, brctl,
        bunzip2, bzcat, bzip2, cal, cat, catv, chat, chattr, chgrp, chmod,
        chown, chpasswd, chpst, chroot, chrt, chvt, cksum, clear, cmp, comm,
        conspy, cp, cpio, crond, crontab, cryptpw, cttyhack, cut, date, dc, dd,
        deallocvt, delgroup, deluser, depmod, devmem, df, dhcprelay, diff,
        dirname, dmesg, dnsd, dnsdomainname, dos2unix, du, dumpkmap,
        dumpleases, echo, ed, egrep, eject, env, envdir, envuidgid, ether-wake,
        expand, expr, fakeidentd, false, fbset, fbsplash, fdflush, fdformat,
        fdisk, fgconsole, fgrep, find, findfs, flock, fold, free, freeramdisk,
        fsck, fsck.minix, fsync, ftpd, ftpget, ftpput, fuser, getopt, getty,
        grep, groups, gunzip, gzip, halt, hd, hdparm, head, hexdump, hostid,
        hostname, httpd, hush, hwclock, id, ifconfig, ifdown, ifenslave,
        ifplugd, ifup, inetd, init, insmod, install, ionice, iostat, ip,
        ipaddr, ipcalc, ipcrm, ipcs, iplink, iproute, iprule, iptunnel,
        kbd_mode, kill, killall, killall5, klogd, last, less, linux32, linux64,
        linuxrc, ln, loadfont, loadkmap, logger, login, logname, logread,
        losetup, lpd, lpq, lpr, ls, lsattr, lsmod, lsof, lspci, lsusb, lzcat,
        lzma, lzop, lzopcat, makedevs, makemime, man, md5sum, mdev, mesg,
        microcom, mkdir, mkdosfs, mke2fs, mkfifo, mkfs.ext2, mkfs.minix,
        mkfs.vfat, mknod, mkpasswd, mkswap, mktemp, modinfo, modprobe, more,
        mount, mountpoint, mpstat, mt, mv, nameif, nanddump, nandwrite,
        nbd-client, nc, netstat, nice, nmeter, nohup, nslookup, ntpd, od,
        openvt, passwd, patch, pgrep, pidof, ping, ping6, pipe_progress,
        pivot_root, pkill, pmap, popmaildir, poweroff, powertop, printenv,
        printf, ps, pscan, pstree, pwd, pwdx, raidautorun, rdate, rdev,
        readahead, readlink, readprofile, realpath, reboot, reformime,
        remove-shell, renice, reset, resize, rev, rm, rmdir, rmmod, route, rpm,
        rpm2cpio, rtcwake, run-parts, runlevel, runsv, runsvdir, rx, script,
        scriptreplay, sed, sendmail, seq, setarch, setconsole, setfont,
        setkeycodes, setlogcons, setserial, setsid, setuidgid, sh, sha1sum,
        sha256sum, sha3sum, sha512sum, showkey, slattach, sleep, smemcap,
        softlimit, sort, split, start-stop-daemon, stat, strings, stty, su,
        sulogin, sum, sv, svlogd, swapoff, swapon, switch_root, sync, sysctl,
        syslogd, tac, tail, tar, tcpsvd, tee, telnet, telnetd, test, tftp,
        tftpd, time, timeout, top, touch, tr, traceroute, traceroute6, true,
        tty, ttysize, tunctl, udhcpc, udhcpd, udpsvd, umount, uname, unexpand,
        uniq, unix2dos, unlzma, unlzop, unxz, unzip, uptime, users, usleep,
        uudecode, uuencode, vconfig, vi, vlock, volname, wall, watch, watchdog,
        wc, wget, which, who, whoami, whois, xargs, xz, xzcat, yes, zcat, zcip