knock(1) on Linux
The text d53e6b7fc4a2, as Arch Linux 2026-11-01, Debian 13 (Trixie), Debian 12 (Bookworm) shipped it. The page shows this text now.
port-knock client
Flags it lists
-
--delay -
--help -
--ipv4 -
--ipv6 -
--udp -
--verbose -
--version -
-4 -
-6 -
-V -
-d -
-h -
-u -
-v