nsupdate(1) on Linux
The text 7727bb6f9358, as Debian 13 (Trixie) shipped it.
dynamic DNS update utility
Flags it lists
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-4 -
-6 -
-A -
-C -
-D -
-E -
-H -
-K -
-L -
-O -
-P -
-S -
-T -
-V -
-d -
-g -
-i -
-k -
-l -
-o -
-p -
-r -
-t -
-u -
-v -
-y