admin@RT-AC87U-A960:/tmp/home/root# busybox
BusyBox v1.25.1 (2017-01-09 23:05:54 WET) multi-call binary.
BusyBox is copyrighted by many authors between 1998-2015.
Licensed under GPLv2. See source distribution for detailed
copyright notices.

Usage: busybox [function [arguments]...]
   or: busybox --list
   or: function [arguments]...

        BusyBox is a multi-call binary that combines many common Unix
        utilities into a single executable.  Most people will create a
        link to busybox for each function they wish to use and BusyBox
        will act like whatever it was invoked as.

Currently defined functions:
        [, [[, arp, arping, ash, awk, basename, blkid, cat, chmod, chown, chpasswd, chroot, clear, cmp, cp, crond, crontab, cut, date, dd, df, diff, dirname, dmesg, dos2unix, du, echo, egrep, env, ether-wake, expr, fdisk, fgrep, find, flock, free, fsync, ftpget, ftpput, getopt, grep, gunzip, gzip, hdparm, head, ifconfig, insmod, ionice, kill, killall, klogd, less, ln, logger, login, ls, lsmod, lsusb, makemime, md5sum, mdev, mkdir, mkdosfs, mkfs.vfat, mknod, mkswap, mktemp, modprobe, more, mount, mv, nc, netstat, nice, nohup, nslookup, ntpd, pidof, ping, ping6, printf, ps, pscan, pwd, readlink, renice, rm, rmdir, rmmod, route, sed, sendmail, setconsole, sh, sleep, sort, strings, swapoff, swapon, sync, syslogd, tac, tail, tar, tee, telnet, telnetd, test, tftp, time, top, touch, tr, traceroute, traceroute6, true, udhcpc, umount, uname, uniq, unix2dos, unzip, uptime, usleep, vconfig, vi, watch, wc, which, xargs, zcat, zcip