In the following cases POSIX allows the default GNU behavior,
so when POSIXLY_CORRECT is set:
- printf and unlink support --help and --option.
+ false, printf, true, unlink, and yes all support --help and --option.
ls supports TABSIZE.
pr no longer depends on LC_TIME for the date format in non-POSIX locales.
printf supports \u, \U, \x.
tail supports two or more files when using the obsolete option syntax.
+ The usual `--' operand is now supported by chroot, hostid, hostname,
+ pwd, sync, and yes.
* Major changes in release 5.2.1 (2004-03-12) [stable]