Try V or X (quoted from perldebug):

V [pkg [vars]]

    Display all (or some) variables in package (defaulting to main) us
+ing a data pretty-printer (hashes show their keys and values so you s
+ee what's what, control characters are made printable, etc.). Make su
+re you don't put the type specifier (like $) there, just the symbol n
+ames, like this:

        V DB filename line

    Use ~pattern and !pattern for positive and negative regexes.

    This is similar to calling the x command on each applicable var.
X [vars]

    Same as V currentpackage [vars].
[download]

Note that I rarely use either.

You could also try the Perl debugger using a Tk GUI.