Looking for way to install Perl CPAN modules centrally on the JH hub. Found the following steps.

1. Make personal Perl configuration for use with CPAN
   1. On the command line enter in: perl -MCPAN -e 'mkmyconfig'
   2. When prompted, press enter to allow automatic configuration.
   3. For “What approach do you want?”, press Enter or Return to select the default option (local::lib).
   4. Press Enter to let the application automatically choose CPAN mirror sites.
   5. press Enter to add the necessary environment variables to your shell configuration file.
   6. If prompted to run automatic configuration again, press Enter to select [yes].
   7. You will see output showing the autoconfiguration is complete written to the following directory
      1. /home/username/.cpan/CPAN/MyConfing.pm
2. When returned to the shell prompt, run the CPAN module; enter: perl -MCPAN -e shell
3. Configure the CPAN module to install new modules in your home directory:
   1. At the (cpan[1]>) prompt enter: o conf makepl_arg INSTALL_BASE=/home/.hub_local/perl5
   2. At the next CPAN prompt, enter: o conf commit
   3. At the next CPAN prompt, enter: exit
4. Modify your environment to use the new library of modules:
   1. Add the following lines to the end of your .bashrc file:

export PERL_MM_OPT="INSTALL_BASE=/home/.hub_local/perl5"
export PERL5LIB="/home/.hub_local/perl5/lib/perl5:$PERL5LIB"
export PATH="/home/.hub_local/perl5/bin:$PATH"
eval $(perl -I/home/.hub_local/perl5/lib/perl5 -Mlocal::lib)

To install a Perl module run: perl -MCPAN -Mlocal::lib -e 'CPAN::install(Math::Matrix)'
To test create a test.pl file and put the following lines in it.

#!/usr/bin/perl
use strict;
use local::lib;
use Math::Matrix;

Save the file and then execute it. It should return with no errors.