fsdb(8) on OpenBSD
The text b2b80c055bad, as OpenBSD 6.1, OpenBSD 6.0, OpenBSD 5.9, OpenBSD 5.8, OpenBSD 5.7, OpenBSD 5.6, OpenBSD 5.5, OpenBSD 5.4, OpenBSD 5.3, OpenBSD 5.2, OpenBSD 5.1 shipped it.
FFS debugging/editing tool
Flags it lists
-
-d -
-f