V [pkg [vars]]
Display all (or some) variables in package (defaulting to main ) using a data pretty-printer (hashes show their keys and values so you see what's what, control characters are made printable, etc.). Make sure you don't put the type specifier (like $ ) there, just the symbol names, like this:
V DB filename line
Use ~pattern and !pattern for positive and negative regexes.
runs the Perl debugger, see
perldoc perldebug
Did you have a specific test you want to want to perform?