fwknopd(8) on Linux
The text a4ee2acb4531, as Debian 7 (Wheezy) shipped it.
Firewall Knock Operator Daemon
Flags it lists
-
--Dump-config -
--Kill -
--Override-config -
--Restart -
--Status -
--Version -
--access-file -
--config -
--foreground -
--fw-list -
--help -
--interface -
--locale -
--packet-limit -
--rotate-digest-cache -
--verbose -
-C -
-D -
-K -
-O -
-R -
-S -
-V -
-a -
-c -
-f -
-h -
-i -
-l -
-v