How to delete a saved game

Yes, absolutely. The tutorial will take you through everything you need to know, and the commands are not sufficiently complex to form anything even approaching the rich language that bash and the like can provide. Experienced shell users might enjoy seeing some of the names carry over (nmap, cat, ...), but it's nothing like the real thing. Indeed, I found it a bit frustrating that I couldn't use most of the features of my real command line in the game.

If you're interested in learning how to drive a real Unix shell, http://overthewire.org/wargames/bandit/ is a fun place to start.

So after you get hacked you go get a new one to restore the GUI. Then after you restart and trace down Naix (Nax? I can't remember) you'll find your x-server.sys in his documents. It'll be [Your Username] x-server.sys
grab it, rename it to x-server.sys then reboot