getcert-request(1) on Linux
The text 31e59905afa9, as Debian 7 (Wheezy) shipped it.
Flags it lists
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-B -
-C -
-D -
-E -
-I -
-K -
-N -
-P -
-R -
-U -
-c -
-d -
-f -
-g -
-k -
-n -
-p -
-r -
-t -
-v