code: def main(argv=None):
      """Lsm2bin command line usage main function."""
      if argv is None:
          argv = sys.argv
      if len(argv) > 1:
          lsm2bin(argv[1], argv[2] if len(argv) > 2 else None)
      else:
          print()
          print(__doc__.strip())
  
label_desc: Use image node_id 1 for calling a global function with example usage: main(argv) without return types