knockd(1) on Linux
The text 0fa0cbb12087, as Debian 4.0 (Etch) shipped it.
port-knock server
Flags it lists
-
--config -
--daemon -
--debug -
--help -
--interface -
--lookup -
--verbose -
--version -
-D -
-V -
-c -
-d -
-h -
-i -
-l -
-v