k5start(1) on Linux
The text 21a5fa24c151, as Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch) shipped it.
Obtain and optionally keep active a Kerberos ticket
Flags it lists
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-F -
-H -
-K -
-L -
-P -
-U -
-a -
-b -
-f -
-g -
-h -
-m -
-n -
-o -
-q -
-s -
-t -
-v -
-x