Enhancement in option parsing errors

Telling getopt to produce an error message by setting opterr to 1

src/ttail_init.c

 		goto ttail_init_alloc_err;
 	}
 
-	opterr = 0;
+	opterr = 1;
 	optind = 0;
 	res->verbose = 0;
 	res->fmt = NULL;
 				strcpy(date, optarg);
 				dates[c=='d'?0:1] = date;
 				break;
-			case '?':
-				optind--;
-				goto init_badarg;
-				break;
-			default:
-				fprintf(stderr, "Bad argument\n");
-				goto init_badarg;
+			default: /* ? */
+				goto ttail_init_err;
 				
 		}
 	}
 	}
 
 	return res;
-	init_badarg:
-	fprintf(stderr, "Unknown option '%s'\n", argv[optind]);
 	ttail_init_err:
 	if(dates[0]) { free(dates[0]); }
 	if(dates[1]) { free(dates[1]); }