code: private static void usage() {
          StringBuilder usageText = new StringBuilder();
          usageText.append("Usage: java -D").append(PROPERTY_PREFIX)
                  .append("config=esigate.properties -jar esigate-server.jar [start|stop]\n\t");
          usageText.append("start    Start the server (default)\n\t");
          usageText.append("stop     Stop the server gracefully\n\t");
  
          System.out.println(usageText.toString());
          System.exit(-1);
      }
docs: Display usage information.