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cmd1 arg1 arg2 2>cmd1.log | cmd2 arg1 2>cmd2.log | cmd3 2>cmd3.log

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execute_cmd(cmd1, @args, $in_fh1, $out_fh1, $err_fh1);
execute_cmd(cmd2, @args, $in_fh2, $out_fh2, $err_fh2);
...
  print $in_fh2 $_;
}