knockd(1) on Linux
The text 3ebb910b3c9e, as Debian 13 (Trixie), Debian 12 (Bookworm) shipped it.
port-knock server
Flags it lists
-
--config -
--daemon -
--debug -
--help -
--interface -
--lookup -
--only-ip-v4 -
--verbose -
--version -
-4 -
-D -
-V -
-c -
-d -
-h -
-i -
-l -
-v