code: public static void main(String[] args) {
          try {
              ParsedCommandLine pcl = new ParsedCommandLine(args);
              Callable<String> command = pcl.getCommand();
              if (command == null) {
                  System.out.println(pcl.getHelpText());
              } else {
                  System.out.println(command.call());
              }
          } catch (Exception ex) {
              System.err.println("ERROR: " + ex.getMessage());
          }
      }
docs: Entry point.
  
  @param args command line arguments