cat less more sed ls apt (install | remove | update | upgrade) df pwd uname lsb_release ping mkdir mv rm gzip whatis free top echo "", echo $value, and echo "$value" groups head man whoami history systemctl grep env hostname nano / vi(m) ifconfig clear (Ctrl + L) su wget / curl last dmesg -w watch screen diff iptable netstat usermod useradd/del chmod touch wc scp base64