openssl-spkac(1ssl) on Linux
The text 6feabcf31c70, as Debian 9 (Stretch) shipped it.
SPKAC printing and generating utility
Flags it lists
-
-challenge -
-engine -
-help -
-in -
-key -
-noout -
-out -
-passin -
-pubkey -
-spkac -
-spksect -
-verify