knocker(1) on Linux
The text 9972f8b218e4, as Debian 3.0 (Woody) shipped it.
A easy to use network security port scanner
Flags it lists
-
--enable-logfile -
--end-port -
--help -
--host -
--no-colors -
--port -
--quiet-mode -
--start-port -
--version -
-EP -
-H -
-P -
-SP -
-h -
-lf -
-nc -
-qm -
-v