in reply to What is Devel::MOD?

You can use an alternative "debugger" MOD accessible under Devel::<MOD> , which will hook into the execution and can inspect various things.

perlrun : 
SYNOPSIS
perl [ -gsTtuUWX ] ... [ -d[t][:debugger] ] ...

[download]

More here:

perlrun#dt:MOD[=bar,baz]

Examples

Cheers Rolf
(addicted to the Perl Programming Language :)
see Wikisyntax for the Monastery

In Section Seekers of Perl Wisdom