You put that inside out, you're testing $_ before you have a value for it. Properly ordered, with the for and the if swapped, the code becomes: 
for my $key (keys %hashs) {
    for (keys %{$hashs{$key}}) {
        print "$key - $hashs{$key}{$_} -> $_\n" 
          if $hashs{$key}{$_} > 1;
      }
  }

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In reply to Re: printing Hash by bart
in thread printing Hash by perlbeginner10

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