- use complementally '!' to '?' - 'ask' is best 'free' char for this.

- more long opt compatibility, can set flag for long opt struct now
- more logic: check opt-depend requires and global requires, special for 'id' and 'start-stop-daemon' applets.

coreutils/date.c

@@ -151,7 +151,7 @@ int date_main(int argc, char **argv)
 #else
 # define GETOPT_ISOFMT
 #endif
-	bb_opt_complementally = "!d~ds:s~ds";
+	bb_opt_complementally = "?d~ds:s~ds";
 	opt = bb_getopt_ulflags(argc, argv, "Rs:ud:r:" GETOPT_ISOFMT,
 					&date_str, &date_str, &filename
 #ifdef CONFIG_FEATURE_DATE_ISOFMT