Using the built-in debugger of Perl as REPL
The command line debugger that comes with perl is very powerful.
Not only does it allow us to debug script but it can be used as a REPL - a Read Eval Print Loop to explore the capabilities of the language. There are a few basic examples in this screencast.
http://perlmaven.com/using-the-built-...
To see all the Perl tutorials visit http://perlmaven.com/perl-tutorial
About Perl Programming and Perl programmers.
In this screencast:
perl -de1
p - print scalar
x - print data structure
b subname - set breakpoint