[~]$ busybox --help
BusyBox v1.37.0 (Debian 1:1.37.0-10.1) multi-call binary.
<snip>
Currently defined functions:
[, [[, acpid, adjtimex, ar, arch, arp, arping, ascii, ash, awk, base64, basename, bc, blkdiscard, blkid, blockdev, brctl,
bunzip2, bzcat, bzip2, cal, cat, chattr, chgrp, chmod, chown, chroot, chvt, clear, cmp, cp, cpio, crc32, crond, crontab,
cttyhack, cut, date, dc, dd, deallocvt, depmod, devmem, df, diff, dirname, dmesg, dnsdomainname, dos2unix, dpkg, dpkg-deb, du,
dumpkmap, dumpleases, echo, ed, egrep, env, expand, expr, factor, fallocate, false, fatattr, fdisk, fgrep, find, findfs, fold,
free, freeramdisk, fsfreeze, fstrim, ftpget, ftpput, getfattr, getopt, getty, grep, groups, gunzip, gzip, halt, head, hexdump,
hostid, hostname, httpd, hwclock, i2cdetect, i2cdump, i2cget, i2cset, i2ctransfer, id, ifconfig, ifdown, ifup, init, insmod,
install, ionice, ip, ipcalc, kill, killall, klogd, last, less, link, linux32, linux64, linuxrc, ln, loadfont, loadkmap, logger,
login, logname, logread, losetup, ls, lsattr, lsmod, lsscsi, lzcat, lzma, lzop, md5sum, mdev, microcom, mim, mkdir, mkdosfs,
mke2fs, mkfifo, mknod, mkpasswd, mkswap, mktemp, modinfo, modprobe, more, mount, mt, mv, nameif, nbd-client, nc, netstat, nl,
nologin, nproc, nsenter, nslookup, nuke, od, openvt, partprobe, passwd, paste, patch, pidof, ping, ping6, pivot_root, poweroff,
printf, ps, pwd, rdate, readlink, realpath, reboot, renice, reset, resize, resume, rev, rm, rmdir, rmmod, route, rpm, rpm2cpio,
run-init, run-parts, sed, seq, setkeycodes, setpriv, setsid, sh, sha1sum, sha256sum, sha3sum, sha512sum, shred, shuf, sleep,
sort, ssl_client, start-stop-daemon, stat, strings, stty, su, sulogin, svc, svok, swapoff, swapon, switch_root, sync, sysctl,
syslogd, tac, tail, tar, taskset, tc, tee, telnet, test, tftp, time, timeout, top, touch, tr, traceroute, traceroute6, true,
truncate, ts, tty, tunctl, ubirename, udhcpc, udhcpc6, udhcpd, uevent, umount, uname, uncompress, unexpand, uniq, unix2dos,
unlink, unlzma, unshare, unxz, unzip, uptime, usleep, uudecode, uuencode, vconfig, vi, w, watch, watchdog, wc, wget, which,
who, whoami, xargs, xxd, xz, xzcat, yes, zcat