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=== Information on Perl ===
Perl is an annoying son of a bitch. I have no idea why this language still exist today... Java is the only language needed on this planet. If you don't know it, learn it. I don't care what you can do with Perl. It's cool, maybe 10 years ago.

== Installing Perl modules ==
For example, to install SOAP:Lite
%%
perl -MCPAN -e 'install SOAP::Lite'
perl -MCPAN -e 'force("install","BSD::Resource");'
%%

==Checking if a specific module is installed==
%%
perl -MModule::Name -e 1
%%

==Listing installed modules==
%%(perl)
#!/usr/bin/perl
# list installed modules
use ExtUtils::Installed;
my $instmod = ExtUtils::Installed->new();
foreach my $module ($instmod->modules()) {
my $version = $instmod->version($module) || "???";
print "$module -- $version\n";
}
%%

==Reinitialize CPAN config==
%%
perl -MCPAN -e shell
cpan> o conf init
%%

==reset URL list==
%%
cpan> o conf urllist
urllist
ftp://ftp.kernel.org/pub/CPAN/
Type 'o conf' to view configuration edit options
cpan> o conf urllist shift
cpan> o conf urllist push ftp://ftp-mirror.internap.com/pub/CPAN/
cpan> o conf urllist
cpan> o conf commit
%%

==Upgrading MCPAN==
The only reason I know is that upgrading MCPAN will remove the annoying message saying the existing one is outdated.
%%
perl -MCPAN -e shell
cpan>install Bundle::CPAN
cpan>reload cpan
%%

==Changing perl lib path==
Example
%%
export PERL5LIB=/usr/lib/perl5/vendor_perl/5.8.0/i386-linux-thread-multi
%%

==Using perl to sendmail directly to MX server==
%%
use Net::SMTP;
#Create a new object with 'new'.
$smtp = Net::SMTP->new("smtp.blah.com");
#Send the MAIL command to the server.
$smtp->mail("perlsucks\@blah.com");
#Send the server the 'Mail To' address.
$smtp->to("recipient\@blah.com");
#Start the message.
$smtp->data();
#Send the message.
$smtp->datasend("Subject: hello\n\n");
$smtp->datasend("Test message.\n\n");
#End the message.
$smtp->dataend();
#Close the connection to your server.
$smtp->quit();
%%