in reply to retrieving persistent variables with Data::Dumper followed by the 'do' command

I like Data::Dumper, or more recently Data::Dump, for printing data structures prettily.

For storing and retrieving data, I would use Jason or Yaml or modules with 'storable' or 'freeze' or 'thaw' in their name.

As Occam said: Entia non sunt multiplicanda praeter necessitatem.