You may want to take a look at the replies to How can I visualize my complex data structure?; and in particular, the reference to I've got a hash of hashes how do i get my values out, which shows how to iterate over an arbitrary complex data structure.

I'd really recommend, however, some basic knowledge first... One of the best discussions of complex data structures, and how to access their innards , is to be found in Chapter 3. References and complex data structures of perlinter.pdf, available from Perl Training Australia. The OP would probably want the most current version of the course notes, though, which have been reworked into progperl.pdf, available from the same page noted above.