private static void usage() {
		System.out.println("Create torrent meta information and output on " +
				"stdout");
		System.out.println("Usage: " +
				"torrent <-f filename> [-a host] [-p port] [-c creator] [-o outfile] [-h|--help]\n");
		System.out.println("\tfilename\t-\tPath of the file used to create " +
				"torrent.");
		System.out.println("\thost\t\t-\tHostname or IP of the tracker. " +
				"Default: " + DEFAULT_HOST);
		System.out.println("\tport\t\t-\tPort the tracker runs on. Default: " +
				Tracker.DEFAULT_TRACKER_PORT);
		System.out.println("\tcreator\t\t-\tName of creator or other id string." +
				" Default: " + DEFAULT_ID);
		System.out.println("\toutfile\t\t-\tOutput file name. If omitted, no" +
				" file is written.");
	}