Read/write permission on a nested folder
The requirement is that the user has "execute" permission on all the parent directories. When you modify the contents of /foo/foobar/foofoobar
, it does not cause any changes in any of its parents directories, so read/write is not necessary.
+x /foo
+x /foo/foobar
-
+rwx /foo/foobar/foofoobar
.