Currently defined functions:
[, [[, ash, awk, basename, cat, chgrp, chmod, chown, chroot, clear, cp, cttyhack, cut, dd, df, dirname,
dmesg, du, echo, egrep, env, expr, false, free, getopt, grep, halt, head, hexdump, ifconfig, init,
install, ip, ipaddr, iplink, iproute, iprule, iptunnel, kbd_mode, kill, killall, less, ln, loadfont,
loadkmap, losetup, ls, md5sum, mkdir, mkfifo, mknod, mktemp, mv, nc, netstat, nslookup, openvt, pgrep,
pidof, ping, ping6, poweroff, printf, ps, pwd, readlink, reboot, rm, rmdir, route, sed, seq, setfont,
sh, sha1sum, sha256sum, sha512sum, sleep, sort, stat, strings, tac, tail, telnet, test, tftp, touch,
true, umount, uname, uniq, uptime, vi, wc, wget, yes