Whine if we discover an unknown option. This program doesn't use

getopt(3) (and can't be converted without breaking compatibility), and
it's very irritating to have it silently DTWT if one combines options
together (e.g., "-msS domain,server").

usr.sbin/ypbind/ypbind.c

@@ -419,6 +419,8 @@ char **argv;
 			yp_restricted_mode(argv[i+1]);
 		else if (strcmp("-m", argv[i]) == 0)
 			yp_manycast++;
+		else
+			errx(1, "unknown option: %s", argv[i]);
 	}
 
 	/* blow away everything in BINDINGDIR (if it exists) */