Perl编程学习资源：Learning Perl 5th Edition

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"Learning Perl 5th.pdf" "Learning Perl 5th" 是一本关于Perl编程语言的权威指南，特别适合初学者和有一定基础的开发者。Perl是一种通用的、解释型的脚本语言，以其强大的文本处理能力和在系统管理、网络编程、网页开发等多个领域的广泛应用而闻名。这本书的第五版提供了全面的Perl教程，涵盖了语言的基本语法、数据结构、控制流、函数、模块化编程等核心概念。作者深入浅出地解释了如何利用Perl进行高效编程，并且包含了大量实例和练习，以帮助读者巩固所学知识。此外，书中还提到了其他与Perl相关的O'Reilly出版社出版的书籍，如"Advanced Perl Programming"，适合那些希望进一步提升Perl技能的读者；"Intermediate Perl"针对有一定基础的学习者，帮助他们过渡到更高级的Perl编程；"Mastering Perl"则是深入解析Perl的高级主题；"Perl6 and Parrot Essentials"为读者介绍了Perl的最新版本Perl 6及其底层虚拟机Parrot；"Perl Best Practices"由 Damian Conway编写，提出了编写高质量Perl代码的指导原则；"Perl Cookbook"则是一本实用的解决方案集合，涵盖了各种常见问题的解决方法；"Perl Debugger Pocket Reference"为调试Perl程序提供了快速参考；"Perl in a Nutshell"是Perl的速查手册，提供简洁的语法和工具概述；"Perl Testing: A Developer's Notebook"专注于Perl的测试实践；"Practical mod-perl"则深入讨论了Perl在Apache服务器上的应用。除了书籍，Perl的在线资源也非常丰富。O'Reilly的Perl Books Resource Center提供了一系列关于Perl和相关技术的样本章节和代码示例，方便读者在线学习。Perl.com是Perl社区的中心网站，是获取Perl最新资讯、教程和资源的理想起点。 O'Reilly组织的会议也是IT专业人士交流和学习的重要平台，他们在会议上汇集了各领域的创新者，分享最新的工具和技术。访问conferences.oreilly.com可以查看即将举办的活动。最后，Safari Bookshelf（safari.oreilly.com）是一个在线参考图书馆，拥有超过1000本书籍的搜索功能，订阅者可以快速找到解答时间紧迫问题的答案，对程序员和IT从业者来说是一个宝贵的资源库。通过"Learning Perl 5th"，读者将能够掌握Perl编程的基础，进一步探索这个强大语言的潜力，并利用丰富的在线资源和社区支持持续深化自己的Perl技能。

• Perl 5.10 includes a switch statement, which it calls given-when. We cover it in

Chapter 15 along with the smart match operator.

• Subroutines now have static variables just like C does, although Perl calls them

state variables. They persist between calls to the subroutine and are lexically

scoped. We cover that in Chapter 4.

Acknowledgments

From Randal. I want to thank the Stonehenge trainers past and present (Joseph Hall,

Tom Phoenix, Chip Salzenberg, brian d foy, and Tad McClellan) for their willingness

to go out and teach in front of classrooms week after week and to come back with their

notes about what’s working (and what’s not), so we could fine-tune the material for

this book. I especially want to single out my coauthor and business associate, Tom

Phoenix, for having spent many, many hours working to improve Stonehenge’s Llama

course and to provide the wonderful core text for most of this book. And brian d foy

for being the lead writer of the fourth edition, including taking that eternal to-do item

out of my inbox so that it would finally happen.

I also want to thank everyone at O’Reilly, especially our very patient editor and overseer

on the previous edition, Allison Randal (no relation, but she has a nicely spelled last

name), and Tim O’Reilly himself for taking a chance on me in the first place with the

Camel and Llama books.

I am also absolutely indebted to the thousands of people who have purchased the past

editions of the Llama so that I could use the money to stay “off the streets and out of

jail,” and to those students in my classrooms who have trained me to be a better trainer,

and to the stunning array of Fortune 1000 clients who have purchased our classes in

the past and will continue to do so into the future.

As always, a special thanks to Lyle and Jack, for teaching me nearly everything I know

about writing. I won’t ever forget you guys.

From Tom. I’ve got to echo Randal’s thanks to everyone at O’Reilly. For the third

edition of this book, Linda Mui was our editor, and I still thank her, for her patience

in pointing out which jokes and footnotes were most excessive (she is in no way to

blame for the ones that remain). Both she and Randal have guided me through the

writing process, and I am grateful. On the fourth edition, Allison Randal stepped in as

editor, and my thanks go to her as well.

I also echo Randal with regard to the other Stonehenge trainers, who hardly ever com-

plained when I unexpectedly updated the course materials to try out a new teaching

technique. You folks have contributed many different viewpoints on teaching methods

that I would never have seen.

xvi | Preface

For many years, I worked at the Oregon Museum of Science and Industry (OMSI), and

I’d like to thank the folks there for letting me hone my teaching skills as I learned to

build a joke or two into every activity, explosion, or dissection.

To the many folks on Usenet who have given me your appreciation and encouragement

for my contributions there, thanks. As always, I hope this helps.

Also to my many students, who have shown me with their questions (and befuddled

looks) when I needed to try a new way of expressing a concept. I hope that the present

edition helps to relieve any remaining puzzlement.

Of course, deep thanks are due especially to my coauthor Randal for giving me the

freedom to try various ways of presenting the material both in the classroom and here

in the book, as well as for the push to make this material into a book in the first place.

And without fail, I must say that I am indeed inspired by your ongoing work to ensure

that no one else becomes ensnared by the legal troubles that have stolen so much of

your time and energy; you’re a fine example.

To my wife, Jenna, thanks for being a cat person, and everything thereafter.

From brian. I have to thank Randal first, since I learned Perl from the first edition of

this book, and then had to learn it again when he asked me to start teaching for Stone-

henge in 1998. Teaching is often the best way to learn. Since then Randal has mentored

me not only in Perl, but in several other things he thought I needed to learn, like the

time he decided that we could use Smalltalk instead of Perl for a demonstration at a

web conference. I’m always amazed at the breadth of his knowledge. He’s the one who

told me to start writing about Perl. Now I’m helping out on the book where I started.

I’m honored, Randal.

I’ve probably only actually seen Tom Phoenix for less than two weeks in the entire time

I’ve worked for Stonehenge, but I’ve been teaching his version of our Learning Perl

course for years. That version turned into the third edition of this book. Teaching Tom’s

new version, I found new ways to explain almost everything, and learned even more

corners of Perl.

When I convinced Randal that I should help out on the Llama update, I was anointed

as the maker of the proposal to the publisher, the keeper of the outline, and the version

control wrangler. Our editor on the fourth edition, Allison Randal, helped me get set

up in all of those roles and endured my frequent emails without complaining.

Special non-Perl thanks to Stacey, Buster, Mimi, Roscoe, Amelia, Lila, and everyone

else who tried to distract me while I was busy but still talked to me even though I

couldn’t come out to play.

From All of Us. Thanks to our reviewers David H. Adler, Andy Armstrong, Dave Cross,

Chris Devers, Paul Fenwick, Stephen B. Jenkins, Matthew Musgrove, Steve Peters, and

Wil Wheaton for providing comments on the draft of this book.

Preface | xvii

about how powerful Perl is and what it can do. In that case, you should check out “A

Whirlwind Tour of Perl,” later in this chapter.

Why Are There So Many Footnotes?

Thank you for noticing. There are a lot of footnotes in this book. Ignore them. They’re

needed because Perl is chock-full of exceptions to its rules. This is a good thing, as real

life is chock-full of exceptions to rules.

But it means that we can’t honestly say, “The fizzbin operator frobnicates the hoozi-

static variables” without a footnote giving the exceptions.

We’re pretty honest, so we

have to write the footnotes. But you can be honest without reading them. (It’s funny

how that works out.)

Many of the exceptions have to do with portability. Perl began on Unix systems, and

it still has deep roots in Unix. But wherever possible, we’ve tried to show when some-

thing may behave unexpectedly, whether that’s because it’s running on a non-Unix

system, or for another reason. We hope that readers who know nothing about Unix

will nevertheless find this book a good introduction to Perl. (And they’ll learn a little

about Unix along the way, at no extra charge.)

And many of the other exceptions have to do with the old “80/20” rule. By that we

mean that 80% of the behavior of Perl can be described in 20% of the documentation,

and the other 20% of the behavior takes up the other 80% of the documentation. So

to keep this book small, we’ll talk about the most common, easy-to-talk-about behavior

in the main text, and hint in the direction of the other stuff in the footnotes (which are

in a smaller font, so we can say more in the same space).

†

Once you’ve read the book

all the way through without reading the footnotes, you’ll probably want to look back

at some sections for reference. At that point, or if you become unbearably curious along

the way, go ahead and read the notes. A lot of them are just computer jokes anyway.

What About the Exercises and Their Answers?

The exercises are at the end of each chapter because, between the three of us, we’ve

presented this same course material to several thousand students.

‡

We have carefully

crafted these exercises to give you the chance to make mistakes as well.

It’s not that we want you to make mistakes, but you need to have the chance. That’s

because you are going to make most of these mistakes during your Perl programming

Except on Tuesdays, during a power outage, when you hold your elbow at a funny angle during the equinox,

or when use integer is in effect inside a loop block being called by a prototyped subroutine prior to Perl

version 5.6.

†

We even discussed doing the entire book as a footnote to save the page count, but footnotes on footnotes

started to get a bit crazy.

‡

Not all at once.

2 | Chapter 1: Introduction

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