Currently defined functions include:
basename, cat, chgrp, chmod, chown, chroot, chvt, clear, cp, cut, date, dc, dd, df, dirname, dmesg, du, dumpkmap, echo, false, fbset, fdflush, find, free, freeramdisk, grep, gunzip, gzip, halt, head, hostname, id, init, insmod, kill, killall, ln, loadfont, loadkmap, logger, ls, lsmod, makedevs, mkdir, mkfifo, mknod, mkswap, more, mount, mv, nc, nslookup, ping, poweroff, ps, pwd, reboot, renice, reset, rm, rmdir, rmmod, sed, setkeycodes, sh, sleep, sort, swapoff, swapon, sync, syslogd, tail, tar, tee, telnet, test, touch, tr, true, tty, umount, uname, uniq, update, uptime, usleep, uudecode, uuencode, wc, which, whoami, yes, zcat, [