Command List:

A: adduser, alias, apropos, arch, at, awk, 
B: basename, bash, bc, bzip2, 
C: cal, cat, cd, chmod, chgrp, chown, clear, cp, cmp, cpio, cron, crontab, csh, cut, 
D: date, dc, dd, df, diff, dirname, disown, dmesg, du, 
E: echo, egrep, env, export, 
F: fg, fgrep, file, find, fold, ftp, fuser, 
G: gawk, getfacl, grep, groupadd, groupdel, groupmod, groups, gzip, 
H: head, history, hostname, hostid
I: id, ifconfig, info, init, iostat, 
J: jobs, join, 
K: kill, killall, ksh, 
L: less, ln, locate, logname, lsof, ls, 
M: mail, man, mkdir, mkfs, more, mount, mv, 
N: netstat, nl, nohup, 
P: passwd, paste, perl, pg, pidof, ping, pkill, popd, pr, ps, pstree, pushd, pwd, 
R: renice, reset, rm, rmdir, rsync, 
S: sar, sed, select, service, set, setfacl, setgid, setuid, sh, sort, spell, split, ssh, stat, stty, su, sudo, systemctl, sysctl, 
T: tar, tail, tee, telnet, test, time, top, touch, traceroute, tr, tree, true, tty, 
U: umask, uname, unmount, uniq, uptime, users, useradd, userdel, usermod, 
V: vi, view, vmstat,
W: w, wc, wget, whatis, whereis, which, who, whoami, 
X: xargs, xz, 
Y: yes, 
Z: zip

A:

adduser:

• Creates a new user account on the system.
• Sets up a home directory for the user.
• Assigns a unique User ID (UID) and…