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Perl Cookbook, Second Edition

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Perl Cookbook, Second Edition, 9780596003135 (0596003137), O'Reilly, 2003
Find a Perl programmer, and you'll find a copy of Perl Cookbook nearby. Perl Cookbook is a comprehensive collection of problems, solutions, and practical examples for anyone programming in Perl. The book contains hundreds of rigorously reviewed Perl "recipes" and thousands of examples ranging from brief one-liners to complete applications. The second edition of Perl Cookbook has been fully updated for Perl 5.8, with extensive changes for Unicode support, I/O layers, mod_perl, and new technologies that have emerged since the previous edition of the book. Recipes have been updated to include the latest modules. New recipes have been added to every chapter of the book, and some chapters have almost doubled in size.

Approaching a programming problem can be like balancing Columbus's egg. If no one shows you how, you may sit forever perplexed, watching the egg—and your program—fall over again and again, no closer to the Indies than when you began. This is especially true in a language as idiomatic as Perl.

This book isn't meant to be a complete reference book for Perl. Keeping a copy of Programming Perl handy will let you look up exact definitions of operators, keywords, functions, pragmata, or modules. Alternatively, every Perl installation comes with a voluminous collection of searchable, online reference materials. If those aren't where you can easily get at them, see your system administrator if you have one, or consult the documentation section at http://www.perl.com.

Neither is this book meant to be a bare-bones introduction for programmers who have never seen Perl before. That's what Learning Perl, a kinder and gentler introduction to Perl, is designed for. (If you're on a Microsoft system, you might prefer the Learning Perl for Win32 Systems version.)

Instead, this is a book for learning more Perl. Neither a reference book nor a tutorial book, Perl Cookbook serves as a companion book to both. It's for people who already know the basics but are wondering how to mix all those ingredients together into a complete program. Spread across 22 chapters and more than 400 focused topic areas affectionately called recipes, this task-oriented book contains thousands of solutions to everyday challenges encountered by novice and journeyman alike.

We tried hard to make this book useful for both random and sequential access. Each recipe is self-contained, but has a list of references at the end should you need further information on the topic. We've tried to put the simpler, more common recipes toward the front of each chapter and the simpler chapters toward the front of the book. Perl novices should find that these recipes about Perl's basic data types and operators are just what they're looking for. We gradually work our way through topic areas and solutions more geared toward the journeyman Perl programmer. Now and then we include material that should inspire even the master Perl programmer.

Each chapter begins with an overview of that chapter's topic. This introduction is followed by the main body of each chapter, its recipes. In the spirit of the Perl slogan of TMTOWTDI, There's more than one way to do it, most recipes show several different techniques for solving the same or closely related problems. These recipes range from short-but-sweet solutions to in-depth mini-tutorials. Where more than one technique is given, we often show costs and benefits of each approach.

As with a traditional cookbook, we expect you to access this book more or less at random. When you want to learn how to do something, you'll look up its recipe. Even if the exact solutions presented don't fit your problem exactly, they'll give you ideas about possible approaches.

Each chapter concludes with one or more complete programs. Although some recipes already include small programs, these longer applications highlight the chapter's principal focus and combine techniques from other chapters, just as any real-world program would. All are useful, and many are used on a daily basis. Some even helped us put this book together.

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