public static void main(String[] args) throws FileNotFoundException {

		if (args.length == 0) {
			// yeah, here's our scanner
			Scanner in = new Scanner(System.in);
			System.out.print("enter command (? for help)>");
			String input = in.nextLine();

			while (!(input.equals("q"))) {
				cmdProc(input);
				System.out.print("enter command (? for help)>");
				input = in.nextLine();
			}
			if (input.equals("q")) {
				System.out.println("quit");
				in.close();
				System.out.close();
			}

		}
		// Oh, thanks for the args. Now we'll process your input file.
		else {
			File inpFile = new File(args[0]);

			// If for some reason it's not there or can't be read.
			if (!inpFile.exists() || !inpFile.canRead()) {
				System.out.println("Invalid input file!");
				System.exit(1);
			}

			Scanner in = new Scanner(inpFile);

			try {
				while (in.hasNextLine()) {
					String temp = in.next();
					cmdProc(temp);
				}
			}finally {
				in.close();
			}

		}
	}