xfs_db(8) on Linux
The text ad10510b7d73, as Debian 9 (Stretch) shipped it.
debug an XFS filesystem
Flags it lists
-
-0 -
-1 -
-2 -
-3 -
-F -
-R -
-V -
-a -
-b -
-c -
-d -
-e -
-f -
-h -
-i -
-l -
-m -
-n -
-o -
-p -
-q -
-r -
-s -
-t -
-v -
-x -
-y -
-z