User-visible changes in release 3.10:
+* mkdir -p now ignores arguments that are existing directories. Before,
+ (contrary to POSIX spec) it would attempt to change ownership and/or
+ protections of existing directories. And it would fail when such a
+ directory was owned by another user.
* Fix bug in cp that made the commands `mkdir dir; touch foo; cp -P foo dir'
incorrectly change the permissions on directory, dir.
* df accepts a new option, --sync, that may ensure it reports more up to