Be careful with that book. If you got the one authored solely by Walsh, I've heard it's full of problems. You want to get the one authored by ( I believe ) Liddie and Walsh. But really the best way to go is to try to pick up a copy of the Perl CD Bookshelf with the Perl/Tk book on it. Much easier to carry around. Plus you get 6 other Perl books on a CD ROM. :)