Currently defined functions:
[, [[, adjtimex, arp, ash, awk, base64, basename, bbconfig, blkid,
blockdev, brctl, bunzip2, bzcat, bzip2, cal, cat, catv, chattr, chcon,
chgrp, chmod, chown, chroot, chvt, clear, cmp, comm, cp, cpio, crond,
crontab, cut, date, dc, dd, deallocvt, depmod, devmem, df, diff,
dirname, dmesg, dnsd, dos2unix, du, echo, ed, egrep, env, expand, expr,
false, fbsplash, fdisk, fgconsole, fgrep, find, findfs, flash_lock,
flash_unlock, flashcp, flock, fold, free, freeramdisk, fstrim, fsync,
ftpget, ftpput, fuser, getenforce, getopt, getsebool, grep, groups,
gunzip, gzip, halt, head, hexdump, hwclock, id, ifconfig, inetd,
insmod, install, ionice, iostat, ip, kill, killall, killall5, less, ln,
losetup, ls, lsattr, lsmod, lsof, lspci, lsusb, lzcat, lzma, lzop,
lzopcat, man, matchpathcon, md5sum, mesg, mkdir, mkdosfs, mke2fs,
mkfifo, mkfs.ext2, mkfs.vfat, mknod, mkswap, mktemp, modinfo, modprobe,
more, mount, mountpoint, mpstat, mv, nanddump, nandwrite, nbd-client,
nc, netstat, nice, nmeter, nohup, nslookup, ntpd, od, openvt, patch,
pgrep, pidof, ping, pipe_progress, pkill, pmap, poweroff, printenv,
printf, ps, pstree, pwd, pwdx, rdate, rdev, readlink, realpath, reboot,
renice, reset, resize, restorecon, rev, rm, rmdir, rmmod, route,
run-parts, runcon, rx, sed, selinuxenabled, seq, sestatus, setconsole,
setenforce, setfiles, setkeycodes, setsebool, setserial, setsid, sh,
sha1sum, sha256sum, sha3sum, sha512sum, sleep, smemcap, sort, split,
stat, strings, stty, sum, swapoff, swapon, switch_root, sync, sysctl,
tac, tail, tar, taskset, tee, telnet, telnetd, test, tftp, tftpd, time,
timeout, top, touch, tr, traceroute, true, ttysize, tune2fs, umount,
uname, uncompress, unexpand, uniq, unix2dos, unlzma, unlzop, unxz,
unzip, uptime, usleep, uudecode, uuencode, vi, watch, wc, wget, which,
whoami, xargs, xz, xzcat, yes, zcat