Display Perl version
perl -v
Display Perl INC path
perl -e 'print join("\n", @INC);'
Open a CPAN shell and there you can just type "install ModuleName"
perl -MCPAN -e shell;
Extending the perl library path
export PERL5LIB=/home/perl/lib:/usr/perl/lib
perl -I /home/perl/lib -I /usr/perl/lib script.pl