Introduction 
A
S
 L
ARRY
 W
ALL
, creator of Perl, puts it,  Perl makes easy jobs easy and hard jobs 
possible.  This is a large part of what makes Perl such a great language most jobs 
really are easy in Perl. But that still leaves the hard ones database access, GUI 
development, Web clients, and so on. While they are undeniably possible in pure 
Perl, they are also certainly not easy. Until you discover CPAN, that is. After that, all 
these jobs and more become a simple matter of choosing the right module. CPAN 
makes hard jobs easy. The first chapter of this book will show you how to get the 
most out of CPAN.
Although you can get a lot done just by using CPAN modules, you can go 
further by creating your own reusable Perl modules. Chapter 2 will teach you how 
to create Perl modules from the ground up. No prior module programming expe 
rience is required. Chapter 3 will improve your skills with a detailed discussion of 
module design and implementation.
Once you're a full fledged Perl module programmer, you'll naturally want to 
share your work. Chapter 4 will show you how to package your modules in module 
distributions. The next step, registering as a module author on CPAN and uploading 
your modules, is covered in Chapter 5. Chapter 6 is all about what happens after 
you upload maintaining your modules as they grow and change over time. Of 
course, some modules are better than others. Chapter 7 examines a collection of 
CPAN's most successful modules to discover the secrets of their success.
The final four chapters offer advanced training in the art of module building. 
Chapters 8, 9, and 10 teach the mysterious art of building Perl modules in C, using 
both XS and Inline::C. Chapter 11 shows you how to package whole CGI applications as 
Perl modules using CGI::Application.
What You Need to Know
To get the most out of this book, you need to know the Perl language. You don't 
need to be a Perl guru, but you should be comfortable with basic syntax. If you can 
write small programs in Perl, then you're ready to get the most out of this book.
If you're not a Perl programmer, there's still a good deal of information about CPAN 
and open source development in this book that you can use. Chapters 1, 6, and 7 
were written to be accessible to nonprogrammers. If those chapters pique your 
interest, consider reading a good introduction to the Perl language and come back 
for the rest when you're ready to write your first module.
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