Life With Unix : A Guide for Everyone.
This is one of my all time favorites - it's the "other book" about Unix. Written in 1989 by Don Libes and Sandy Ressler it covers Unix history and trivia like why the biff command is called biff (not that biff is in wide use these days). From "The Future of Usenet" in the UNIX Underground section: "Usenet is also feeling pressure to become more commercial". How true - I can still remember the first day I saw a .com email address (most people had .edu or .gov or country addressess like .no back in '89). Buy one if you can get hold of it (rare and thus expensive - between$80 and $299 for a used copy when I looked at amazon in November 2002).