code: private static void printUsage(String cmd) {
      String prefix = "Usage: java " + HighTideShell.class.getSimpleName();
      if ("-showConfig".equals(cmd)) {
        System.err.println("Usage: java org.apache.hadoop.hdfs.HighTideShell");
      } else {
        System.err.println("Usage: java HighTideShell");
        System.err.println("           [-showConfig ]");
        System.err.println("           [-help [cmd]]");
        System.err.println();
        ToolRunner.printGenericCommandUsage(System.err);
      }
    }
docs: Displays format of commands.