ls, cd, pwd, mkdir, rmdir, touch, cp, mv, rm, tree, find, locate, updatedb, stat, file

df, du, mount, umount, blkid, lsblk, fdisk, parted, mkfs, fsck

free, top, htop, ps, kill, killall, nice, renice, jobs, bg, fg, &, watch,
uptime, lscpu, lsmem, uname, hostname, whoami, who, w, id, groups

chmod, chown, chgrp, umask, getfacl, setfacl, ln, lsattr, chattr

tar, gzip, gunzip, bzip2, bunzip2, xz, unxz, zip, unzip, dd

nano, vim, cat, less, more, head, tail

cut, wc, sort, uniq, grep, egrep, awk, sed, tr, xargs, tee

cron, crontab, at, systemctl, journalctl, timedatectl, hostnamectl

ip, ss, ping, traceroute, dig, nslookup, host, nmcli, curl, wget, ssh, scp, sftp

useradd, usermod, userdel, groupadd, groupmod, passwd, chage, su, sudo, visudo

iptables, ufw, firewall-cmd

rpm, dnf, yum, dpkg, apt, snap, flatpak

modprobe, lsmod, insmod, rmmod, sysctl

echo, read, source, export, env, alias, history, bash, sh

Mastering Linux One Command at a Time: My Linux+ Study Cheatsheet