pfctl(8) on OpenBSD
The text a3e6fbd20b66, as OpenBSD 5.5, OpenBSD 5.4 shipped it.
control the packet filter (PF) device
Flags it lists
-
-D -
-F -
-L -
-P -
-S -
-T -
-a -
-d -
-e -
-f -
-g -
-h -
-i -
-n -
-o -
-p -
-q -
-r -
-s -
-t -
-v -
-x -
-z