nmtree(8) on FreeBSD
The text fd7653e8f444, as FreeBSD 9.3-RELEASE, FreeBSD 9.2-RELEASE shipped it.
map a directory hierarchy
Flags it lists
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-C -
-D -
-E -
-F -
-I -
-K -
-L -
-M -
-N -
-P -
-R -
-S -
-U -
-W -
-X -
-b -
-c -
-d -
-e -
-f -
-i -
-j -
-k -
-l -
-m -
-n -
-p -
-q -
-r -
-s -
-t -
-u -
-x