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  1. or download this
    #!/usr/bin/perl -lw
    use POSIX;
    ...
    print STDERR "STDOUT= ".fileno(STDOUT);
    open(INPUT, "<$TRAP") || die("$!: $TRAP");
    $chldoutput = <INPUT>;
    
  2. or download this
    open(MYSTDOUT, ">&STDOUT");
    
  3. or download this
    open(STDOUT, ">&MYSTDOUT");