echo -e '\xHH' now outputs a byte whose hexadecimal value is HH,
for compatibility with bash.
+ In the following cases POSIX allows the default GNU behavior,
+ so when POSIXLY_CORRECT is set:
+
+ printf and unlink 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.
+
* Major changes in release 5.2.1 (2004-03-12) [stable]