Currently defined functions:
[, [[, arping, awk, busybox, chmod, clear, cp, crond, crontab,
cut, dd, df, dmesg, du, egrep, env, expr, false, fgrep, find,
fold, free, ftpget, ftpput, grep, gzip, head, ifconfig, insmod,
kill, killall, klogd, ln, logger, logread, ls, lsmod, mkdir, mkfifo,
mktemp, modprobe, mount, msh, mv, nc, netstat, nslookup, pidof,
ping, pivot_root, ps, rmmod, sed, seq, sh, sleep, sort, strings,
sysctl, syslogd, tail, tar, tee, test, tftp, top, touch, tr, traceroute,
true, umount, uname, uniq, uptime, usleep, vconfig, wc, wget,
which