Want to learn basic unix cmds quickly? Prefer learning by doing? So, its for you.
Follow easy exercises and learn your terminal, by real typing valid commands.
Run it easily:
bash <(curl -s https://raw.githubusercontent.com/drKraken/interactive-shell/master/interactive.sh)
If you accidentally leave script, dont be afraid, script will save all your scores and you can return from point where you finished it.