kxd(1) on Linux
The text a72983baf1db, as Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie) shipped it.
Key exchange daemon
Flags it lists
-
--cert -
--data_dir -
--email_from -
--ip_addr -
--key -
--logfile -
--port -
--smtp_addr