ldns-signzone(1) on Linux
The text 6f10e75d643b, as Debian 10 (Buster), Debian 9 (Stretch) shipped it.
sign a zonefile with DNSSEC data
Flags it lists
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-A -
-E -
-K -
-a -
-b -
-d -
-e -
-f -
-i -
-k -
-n -
-o -
-p -
-s -
-t -
-v