In what format do you want your file to be?

If the file doesn't have to be user-readable, I'd use Storable

JSON provides a portable format that's rather user-readable but not very user-modifyable.

There's also YAML and XML::Simple.

Data::Dumper can be used to dump a structure as Perl code, so you can simple use do or eval, but that allows arbitrary execution of Perl code. I recommend against this.

All of the above support the storage of complex structures. However, that makes them harder for users to edit them manually. A lot of modules on CPAN provide the facilities to read and write a variety of user-modifyable formats, but I don't have any to recommend.

Why invent yet another format. There are plenty from which to choose already.

Updated

In reply to Re: Writing a hash of two variables to a file by ikegami
in thread Writing a hash of two variables to a file by Resin

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