CHAPTER 1
CPAN
T
HE
 C
OMPREHENSIVE
 P
ERL
 A
RCHIVE
 N
ETWORK
(CPAN) is an Internet resource con 
taining a wide variety of Perl materials modules, scripts, documentation, and 
Perl itself that are open source and free for all to download and use. CPAN has 
more Perl modules available than any other resource, including modules for 
almost every conceivable task from database access to GUI development and 
everything in between. The primary gateway to CPAN is http://www.cpan.org.
No other programming community has a resource like CPAN. CPAN enables 
the Perl community to pool its strength and develop powerful solutions to difficult 
problems. Once a module is available on CPAN, everyone can use it and improve 
it. Only the most unusual Perl project needs to start from scratch.
CPAN is more than just a repository it's a community. The modules on CPAN 
are released under open source licenses, and many are under active development. 
Modules on CPAN often have mailing lists dedicated to their development with 
hundreds of subscribers.
As the name implies, CPAN is a network. CPAN servers around the world 
provide access to the collection. See the  Network Topology  section later in this 
chapter for details.
Why Contribute to CPAN?
CPAN thrives on the time and energy of volunteer programmers. You may be sur 
prised that so many talented programmers are willing to work for free. Some CPAN 
programmers aren't actually donating their time they're being paid to work on 
CPAN modules! This is certainly the minority, so let's look at some other reasons to 
join the CPAN community.
The Programmer's Incentive
For the lone programmer, contributing to CPAN is an excellent way to show the 
world your programming savvy. A programmer's resume is only an introduction; a 
smart employer wants proof. This can be hard to provide if all your work has been 
on closed source projects. Open source software is easy to evaluate if you're 
good, employers will know it immediately. There's nothing quite like walking into 
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