FILE *outfile = stdout;
static int maxdev, devno, i, crlf, d4, opt;
- while ((opt = getopt(argc, argv, "I:O:4n")) != -1) {
+ while ((opt = getopt(argc, argv, "I:O:4n?")) != -1) {
switch (opt) {
case 'I':
infile = fopen(optarg, "r");
d4 = 1;
break;
+ case '?':
+ print_usage(basename(argv[0]));
+ return 0;
+ break;
+
default:
fprintf(stderr, "Unknown option %c\n", opt);
print_usage(basename(argv[0]));