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    +------------------------+----------------------+
| Parent                 | Child                |
...
|                        |                      |   v
| Still waiting...       | Still waiting...     |
+------------------------+----------------------+
  2. or download this
    my %lookup = (
   \*OUT => [ \*OUT, 'STDOUT', '' ],
...
   print("$lookup{$fh}[1]: $lookup{$fh}[2]\n")
      if length $lookup{$fh}[2];
}