knockd(1) on Linux
The text a50d1bcad7ba, as Debian 3.1 (Sarge) shipped it.
port-knock server
Flags it lists
-
--config -
--daemon -
--debug -
--help -
--interface -
--verbose -
--version -
-D -
-V -
-c -
-d -
-h -
-i -
-v