A book I used when teaching myself Perl five years ago. And a book riddled with typographical errors. I probably learned more Perl correcting the typos there than I did from the book itself.

When I got frustrated with that book, I would switch off and work through a few chapters in Randal L Schwartz's Learning Perl (O'Reilly), now in its third edition and popularly known as the Llama book. I subsequently taught introductory Perl from Randal's book. I've had many occasions to refresh my knowledge by looking something up in the Llama, but have only referred back to "21 Hours."

Jim Keenan