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If you want all the unique keys from all the array elements, you can traverse it similar to as described above, and just keep track (in a hash) of the keys you've seen.
my %allKeys; foreach my $i ( 0 .. $#data ){ my $hash = $data[$i]; for (keys %$hash) { push @{$allKeys{$_}}, $i; } } foreach my $key ( sort keys %allKeys ){ my $locations = $allKeys{$key}; printf "Key '%s' was seen %d times at these indices: %s\n", $key, scalar @$locations, join(", ", @$locations); }

In reply to Re: Listing Keys in a specific element(s) in an array of hashs by davidrw
in thread Listing Keys in a specific element(s) in an array of hashs by Anonymous Monk

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