This is invaluable: 900 pages of wheels that I don't have to reinvent, with tons of code samples that actually work. Perfect, especially, for the self-taught programmer who needs to get a lot of text reformatted fast.
One nice feature is that the authors often point the reader to pre-existing modules: otherwise, how would I know to look for them?
I wish every language I have ever used had a Cookbook like this one. If you know and love PERL, then you will love this book. It has clear examples of almost anything you could ever want to do with PERL. I didn't read it in order, but over the years I'm sure I read 90% of this cookbook. I got this as a Christmas Gift December 1998 while I was working at my first Internet startup company, e-Markets.
If you only use Perl occasionaly, this is a fantastic book. It is organized using "recipes" for accomplishing common tasks, so when you get stuck, you can look up the operation you are trying to implement.