opendkim-genkey(8) on Linux
The text 295d56ed9228, as Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch) shipped it.
DKIM filter key generation tool
Flags it lists
-
--help -
-D -
-S -
-V -
-a -
-b -
-d -
-h -
-n -
-r -
-s -
-t -
-v