pfctl(8) on OpenBSD
The text 6bc005c65d16, as OpenBSD 3.6 shipped it.
control the packet filter (PF) and network address translation (NAT) device
Flags it lists
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-A -
-D -
-F -
-N -
-O -
-R -
-T -
-a -
-d -
-e -
-f -
-g -
-h -
-i -
-k -
-n -
-o -
-p -
-q -
-r -
-s -
-t -
-v -
-x -
-z