The only explanation I can see is that the omitted code changes @parents and/or %parents.

By the way, are you sure @parents contains a subset of the keys of %parents? If you didn't care about order, you could do 

  foreach my $parent (keys %parents)
  {
    print FILE_OUT $parents{$parent} . "\n";
  }

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In reply to Re: readdir and print file issue by ikegami
in thread readdir and print file issue by eide

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