mtree(8) on OpenBSD
The text 0e0b5a5b9fc8, as OpenBSD 2.5, OpenBSD 2.4 shipped it.
map a directory hierarchy
Flags it lists
-
-K -
-U -
-c -
-d -
-e -
-f -
-i -
-k -
-n -
-p -
-q -
-r -
-s -
-t -
-u -
-x