The simplest and quickest method to install a CPAN module is to use the perl shell subroutine.
To run the shell subroutine from command-line, use:
# perl -MCPAN -e shell
This command runs Perl, loads the “CPAN” module into memory and runs the shell soubroutine.
So to install, for example, the WWW::Mechanize module you have to simply execute:
cpan> install WWW::Mechanize
and the shell subroutine will connect to the internet cpan website and will download and automatically install your module.