code: private void printHelpAndExit(int exitCode) {
      HelpFormatter hf = new HelpFormatter();
  
      hf.printHelp("gobblin-admin.sh <command> [options]", this.options);
      System.out.println("Valid commands:");
      for (String command : getCommandNames()) {
        System.out.println(command);
      }
  
      System.exit(exitCode);
    }
docs: Print help and exit with the specified code.
  @param exitCode The code to exit with