How can I tell if a Perl module is core or part of the standard install?

Question

How can I check if a Perl module is part of the core - i.e. it is part of the standard installation?

I\'m looking for:

• a command-line command:

Answer 1

• From the command-line:

  Let's say that you want to know whether module Tie::Hash is installed.
  To find out, execute the following from the command line:

  perl -MTie::Hash -e 1
  

  If you don't get any output from the above command then the module is installed; if you get an error, it's not installed.

• For making this check from within the script you can make use of Module::Load::Conditional.