深入掌握Perl：高级开发指南

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"Mastering Perl: Jul. 2007"是一本深入探讨高级Perl开发技术的权威指南，它是继"Learning Perl"和"Intermediate Perl"的学习成果后，进一步提升Perl技能的必读书籍。这本书为读者提供了丰富的实践经验和高级概念，帮助开发者熟练掌握这门强大的脚本语言。该书涵盖了广泛的Perl主题，包括但不限于模块化编程、对象导向编程、网络编程、数据库操作、系统管理和性能优化等方面。通过阅读，读者将能够学习如何设计高效、可维护的代码，并且理解和应用最佳实践，提高代码质量和生产率。在资源方面，O'Reilly出版社为Perl爱好者提供了多种宝贵的资料。例如，"Advanced Perl Programming"与"Intermediate Perl"共同构成了Perl进阶学习路径，为不同层次的开发者提供了逐步升级的学习资料。此外，"Perl Best Practices"是一本关于编写高质量Perl代码的实用指南，有助于避免常见陷阱并遵循行业标准。 "Perl CD Bookshelf"则可能包含了一系列精选的Perl书籍光盘，方便用户获取电子版本或实体资源。"Perl Testing: A Developer's Notebook™"专注于测试和调试，确保代码的可靠性和健壮性。"Programming Perl"和"Hacks Series Home"分别提供详尽的教程和解决实际问题的快捷方法，而"hacks.oreilly.com"则是一个社区平台，开发者可以在这里分享技巧和工具，涵盖了MacOSX、Linux、Google、Windows XP等多个平台。 "Perl.com"作为Perl社区的核心网站，汇集了大量关于Perl的知识资源，无论是初学者还是资深开发者都能在此找到所需的信息。从基础入门到高级技术，无论是文档、教程、代码示例，还是社区活动和讨论，都能在Perl.com找到答案。 O'Reilly还举办各种Perl相关的会议和研讨会，旨在促进创新思维的交流和最新技术的传播。"Safari Bookshelf"（safari.oreilly.com）作为一个在线学习平台，为用户提供了一站式的访问，可以直接浏览和订阅众多Perl和技术相关的电子书。 "Mastering Perl: Jul. 2007"不仅是一本技术深度的书籍，而且结合了丰富的学习资源和社区支持，为Perl开发者提供了一个全面的学习和发展环境。对于想要在Perl领域深入探索和提升的开发者来说，这是不可或缺的参考资料。

Conventions Used in This Book

The following typographic conventions are used in this book:

Constant width

Used for function names, module names, environment variables, code snippets,

and other literal text

Italics

Used for emphasis, Perl documentation, filenames, and for new terms where they

are defined

Using Code Examples

This book is here to help you get your job done. In general, you may use the code in

this book in your programs and documentation. You do not need to contact O’Reilly

for permission unless you’re reproducing a significant portion of the code. For example,

writing a program that uses several chunks of code from this book does not require

permission. Selling or distributing a CD-ROM of examples from O’Reilly books does

require permission. Answering a question by citing this book and quoting example code

does not require permission. Incorporating a significant amount of example code from

this book into your product’s documentation

does require permission.

We appreciate, but do not require, attribution. An attribution usually includes the title,

author, publisher, and ISBN. For example: “Mastering Perl by brian d foy. Copyright

2007 O’Reilly Media, Inc., 978-0-596-52724-2.”

If you feel your use of code examples falls outside fair use or the permission given above,

feel free to contact us at permissions@oreilly.com.

Safari® Enabled

When you see a Safari® Enabled icon on the cover of your favorite tech-

nology book, that means the book is available online through the O’Reilly

Network Safari Bookshelf.

Safari offers a solution that's better than e-books. It’s a virtual library that lets you easily

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Preface | xv

CHAPTER 1

Introduction: Becoming a Master

This book isn’t going to make you a Perl master; you have to do that for yourself by

programming a lot of Perl, trying a lot of new things, and making a lot of mistakes. I’m

going to help you get on the right path. The road to mastery is one of self-reliance and

independence. As a Perl master, you’ll be able to answer your own questions as well as

those of others.

In the golden age of guilds, craftsmen followed a certain path, both literally and figu-

ratively, as they mastered their craft. They started as apprentices and would do the

boring bits of work until they had enough skill to become the more trusted journeymen.

The journeyman had greater responsibility but still worked under a recognized master.

When he had learned enough of the craft, the journeyman would produce a “master

work” to prove his skill. If other masters deemed it adequately masterful, the journey-

man became a recognized master himself.

The journeymen and masters also traveled (although people disagree on whether that’s

where the “journey” part of the name came from) to other masters, where they would

learn new techniques and skills. Each master knew things the others didn’t, perhaps

deliberately guarding secret methods, or knew it in a different way. Part of a

journeyman’s education was learning from more than one master.

Interactions with other masters and journeymen continued the master’s education. He

learned from those masters with more experience and learned from himself as he taught

journeymen, who also taught him because they brought skills they learned from other

masters.

The path an apprentice followed affected what he learned. An apprentice who studied

with more masters was exposed to many more perspectives and ways of teaching, all

of which he could roll into his own way of doing things. Odd teachings from one master

could be exposed by another, giving the apprentice a balanced view on things. Addi-

tionally, although the apprentice might be studying to be a carpenter or a mason,

different masters applied those skills to different goals, giving the apprentice a chance

to learn different applications and ways of doing things.

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