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  1. or download this
    $their_stdout = <<`END_CMDS`; die "oops: wstat $?, errno $!" if $?;
      (
    ...
         echo status;
      ) | lsnrctl
    END_CMDS
    
  2. or download this
        # variables normally expand
        $bunches =  "\t@these + @those\n";
    ...
        # *distributively* suppress variable expansion
        @rpair = \(@these,  @those);
    
  3. or download this
        $place{ 040 } = 1;
        $place{'040'} = 2;
    ...
             040  => 1,
            '040' => 2,
        );