Are you talking about something related to rational ClearCase?

If so, I assume (but I don't know clearcase) that there are command line tools for getting information about these VOBs.

If that's true, your best / easiest strategy would be to run those tools from perl and extract the pertinent data from their output.

For instance, you can get the output of a program as a string by running it using `` quotes:

my $output = `/some/tool -and -some options`;
[download]

you can then do with $output what you will.

See also perlintro.