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Perl Cookbook
http://kickme.to/tiger/
By Tom Christiansen & Nathan Torkington; ISBN 1-56592-243-3, 794 pages.
First Edition, August 1998.
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Table of Contents
Foreword
Preface
Chapter 1: Strings
Chapter 2: Numbers
Chapter 3: Dates and Times
Chapter 4: Arrays
Chapter 5: Hashes
Chapter 6: Pattern Matching
Chapter 7: File Access
Chapter 8: File Contents
Chapter 9: Directories
Chapter 10: Subroutines
Chapter 11: References and Records
Chapter 12: Packages, Libraries, and Modules
Chapter 13: Classes, Objects, and Ties
Chapter 14: Database Access
Chapter 15: User Interfaces
Chapter 16: Process Management and Communication
Chapter 17: Sockets
Chapter 18: Internet Services
Chapter 19: CGI Programming
Chapter 20: Web Automation
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Copyright
© 1999
O'Reilly & Associates.
All Rights Reserved.
Foreword
Next:
Preface
Foreword
They say that it's easy to get trapped by a metaphor. But some metaphors are so magnificent that you
don't mind getting trapped in them. Perhaps the cooking metaphor is one such, at least in this case. The
only problem I have with it is a personal one - I feel a bit like Betty Crocker's mother. The work in
question is so monumental that anything I could say here would be either redundant or irrelevant.
However, that never stopped me before.
Cooking is perhaps the humblest of the arts; but to me humility is a strength, not a weakness. Great
artists have always had to serve their artistic medium - great cooks just do so literally. And the more
humble the medium, the more humble the artist must be in order to lift the medium beyond the mundane.
Food and language are both humble media, consisting as they do of an overwhelming profusion of
seemingly unrelated and unruly ingredients. And yet, in the hands of someone with a bit of creativity and
discipline, things like potatoes, pasta, and Perl are the basis of works of art that "hit the spot" in a most
satisfying way, not merely getting the job done, but doing so in a way that makes your journey through
life a little more pleasant.
Cooking is also one of the oldest of the arts. Some modern artists would have you believe that so-called
ephemeral art is a recent invention, but cooking has always been an ephemeral art. We can try to preserve
our art, make it last a little longer, but even the food we bury with our pharoahs gets dug up eventually.
So too, much of our Perl programming is ephemeral. This aspect of Perl cuisine has been much
maligned. You can call it quick-and-dirty if you like, but there are billions of dollars out there riding on
the supposition that fast food is not necessarily dirty food. (We hope.)
Easy things should be easy, and hard things should be possible. For every fast-food recipe, there are
countless slow-food recipes. One of the advantages of living in California is that I have ready access to
almost every national cuisine ever invented. But even within a given culture, There's More Than One
Way To Do It. It's said in Russia that there are more recipes for borscht than there are cooks, and I
believe it. My mom's recipe doesn't even have any beets in it! But that's okay, and it's more than okay.
Borscht is a cultural differentiator, and different cultures are interesting, and educational, and useful, and
exciting.
So you won't always find Tom and Nat doing things in this book the way I would do them. Sometimes
they don't even do things the same way as each other. That's okay - again, this is a strength, not a
weakness. I have to confess that I learned quite a few things I didn't know before I read this book. What's
more, I'm quite confident that I still don't know it all. And I hope I don't any time soon. I often talk about
Perl culture as if it were a single, static entity, but there are in fact many healthy Perl subcultures, not to
mention sub-subcultures and supercultures and circumcultures in every conceivable combination, all
inheriting attributes and methods from each other. It can get confusing. Hey, I'm confused most of the
time.
So the essence of a cookbook like this is not to cook for you (it can't), or even to teach you how to cook
(though it helps), but rather to pass on various bits of culture that have been found useful, and perhaps to
filter out other bits of "culture" that grew in the refrigerator when no one was looking. You in turn will
pass on some of these ideas to other people, filtering them through your own experiences and tastes, your
creativity and discipline. You'll come up with your own recipes to pass to your children. Just don't be
surprised when they in turn cook up some recipes of their own, and ask you what you think. Try not to
make a face.
I commend to you these recipes, over which I've made very few faces.
- Larry Wall
June, 1998
Perl
Cookbook
Book
Index
Next:
Preface
Preface
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