[cwinters@genesee cwinters]$ perldoc -q hash Found in /usr/local/lib/perl5/5.6.1/pod/perlfaq3.pod How can I free an array or hash so my program shrinks? ... Found in /usr/local/lib/perl5/5.6.1/pod/perlfaq4.pod How do I test whether two arrays or hashes are equal? ... Data: Hashes (Associative Arrays) How do I process an entire hash? ... What happens if I add or remove keys from a hash while iterating over it? ... How can I always keep my hash sorted? ... What's the difference between "delete" and "undef" with hashes? ... How do I sort a hash (optionally by value instead of key)? (etc.)