http://www.perlmonks.org?node_id=831732


in reply to Getting loopy while appending HoH

Keys to a hash must be unique. $apid is the same value for every iteration through your loop. If you need to support multiple values per key, you could use a Hash-of-Arrays... data structure.

As an aside, Data::Dumper is a convenient way to display your whole data structure:

print Dumper(\%cmdData);