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  1. or download this
    $ perl -e'open my $fh, "cat |" or die $!'
<waits forever>

$ perl -e'open our $fh, "cat |" or die $!'
<returns immediately>
  2. or download this
    $ perl -e'open our $fh, "cat |" or die $!; close($fh)'
<waits forever>
  3. or download this
    $ perl -e'my $pid = open my $fh, "cat |" or die $!; kill TERM => $pid'
<returns immediately>