recon this should accomplish what you are asking for:

$href = \%drw;
foreach ( keys %$href) {
  print "primaryKey = $_\n";
  foreach ( keys %{$href->{$_}}) { 
    print "\tsubKey = $_\n";
  }
}
[download]

However your question is a bit ambiguous, I quote “am looking how to be able to list the keys on the second hash gate do you know how I might do this. The second loop I would hope to receive "eone", "etwo", "ethree"” If you want to receive "eone", "etwo", "ethree"” these are the values of the subkeys. Which one do you want Keys or Values of subkeys? If you indeed would like the values use the below code:

$href = \%drw;
foreach ( keys %$href) {
  print "primaryKey = $_\n";
  foreach ( values %{$href->{$_}}) { 
    print "\tsubKeyValue = $_\n";
  }
}
[download]

-3DBC ;-)