CPAN
The CPAN module is versatile tool with myriad options and capabilities. While 
in the CPAN shell, you can get a description of the available commands using the 
help command. Also, to learn more about the module itself, you can access the 
CPAN documentation, using the perldoc utility:
$ perldoc CPAN
The Hard Way
The CPAN module may not be right for you. You may be behind a firewall or you 
might prefer more control over the module installation process. Also, some CPAN 
modules, usually older ones, aren't written to work with the CPAN module. If this is 
the case, then you'll need to install modules the hard way. Put on your opaque sun 
glasses and grab your towel.
Location
First, find the module you want to download on the CPAN server near you. An easy 
way to do this is by using the CPAN Search facilities described earlier. The file 
you're looking for will end in either .tar.gz or .zip. CPAN modules have version 
numbers, and there will usually be a list of versions to choose from. You'll generally 
want to choose the highest version number available. Download the module file 
and put it in a working directory on your local machine.
Decompression
These files are compressed, so the first thing you'll need to do is uncompress them 
to get at their contents. Under UNIX systems this is usually done with the tar and 
gzip utilities:
$ gzip  dc ModuleNameHere.tar.gz | tar xvf  
Under Windows you can use tools such as WinZip, available at 
http://www.winzip.com, or install a Windows port of the GNU utilities such as 
CygWin, which includes tar and gzip. CygWin is available at http://cygwin.com.
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