kcapi-rng(1) on Linux
The text 7f97eaaab44a, as Debian 10 (Buster) shipped it.
Kernel Crypto API Random Number Gatherer
Flags it lists
-
--bytes -
--help -
--hex -
--name -
--quiet -
--verbose -
--version -
-b -
-h -
-n -
-q -
-v