whois(1) on Linux
The text 68f1a91d7379, as Debian 10 (Buster) shipped it.
client for the whois directory service
Flags it lists
-
--help -
--host -
--port -
--verbose -
--version -
-B -
-G -
-H -
-K -
-L -
-M -
-R -
-T -
-a -
-b -
-c -
-d -
-g -
-h -
-i -
-l -
-m -
-p -
-q -
-r -
-s -
-t -
-v -
-x