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  1. or download this
        $ util -x this that
  2. or download this
        if(  @ARGV  &&  $ARGV[0] eq "-child"  ) {
        shift( @ARGV );
...
    # ...
    system( 1, $^X, $0, "-child", @ARGV ); # run child
    # ...
  3. or download this
            shift( @ARGV );
        # child code here
        exit( 0 );