code: private static void printHelp(final Options options) {
  	StringBuilder sb = new StringBuilder();
  
  	sb.append("java -jar icegem-cache-utils-<version>.jar [options] <");
  
  	Command[] commands = Command.values();
  	
  	for (int i = 0; i < commands.length; i++) {
  	    sb.append(commands[i].getName());
  	    
  	    if (i < (commands.length - 1)) {
  		sb.append(" | ");
  	    }
  	}
  
  	sb.append("> [command_specific_options]");
  
  	HelpFormatter formatter = new HelpFormatter();
  	
  	formatter.printHelp(sb.toString(), options);
  
  	Utils.exitWithFailure();
      }
docs: Prints help if requested.
  
  @param options
  - The GNU options.