etcupdate(8) on FreeBSD
The text ddddb431f56a, as FreeBSD 12.2-RELEASE shipped it.
manage updates to system files not updated by installworld
Flags it lists
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-A -
-B -
-D -
-F -
-I -
-L -
-M -
-d -
-n -
-p -
-r -
-s -
-t