I can recommend Michael W Lucas new book Ed Mastery.
Once I had only /bin available and vi was in /use/bin. I wish I had read that book before. Ed is more useful than I thought.

By nielsk

I am a sysadmin with a background in Japanese Science and economics. Thus my topics are computers, Japan and economics. My favorite past times are pen&paper-role playing games and old video games.

With a couple of friends I also podcast about retro video games in German: Retrozirkel