Perl

To see what modules are running on your unix machine
> find `perl -e 'print "@INC"'` -name '*.pm' -print

To use the CPAN shell tool:
> sudo perl -MCPAN -e shell

> install Spread***::WriteExcel

With this command, the CPAN shell will automatically download the
module, find & retrieve any dependencies like Parse::RecDescent and
File::Temp, and unpack, configure, make, test, and install for you.

To print the version
> perl -v

To print the configuration summary
> perl -V

Additional Information

TechPublic - Perl Modules

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