unbound-anchor(8) on Linux
The text 5dd4f43a8e7e, as Debian 7 (Wheezy) shipped it.
Unbound anchor utility.
Flags it lists
-
-4 -
-6 -
-C -
-F -
-P -
-a -
-c -
-f -
-h -
-l -
-r -
-s -
-u -
-v -
-x