code: public static void printUsage(ParseException e, String cmdLine,
  			Options options) {
  		System.err.println(e.getMessage());
  		// automatically generate the help statement
  		HelpFormatter formatter = new HelpFormatter();
  		PrintWriter pw = new PrintWriter(System.err);
  		formatter.printUsage(pw, cmdLine.length() + 7, cmdLine, options);
  		pw.flush();
  	}
docs: Prints the command line usage to the std error output
  
  @param e
  The error that raised the help message
  @param cmdLine
  The command line usage
  @param options
  The options expected