fsdb(8) on OpenBSD
The text 1ab025cdbcee, as OpenBSD 5.0, OpenBSD 4.9, OpenBSD 4.8, OpenBSD 4.7, OpenBSD 4.6, OpenBSD 4.5, OpenBSD 4.4 shipped it.
FFS debugging/editing tool
Flags it lists
-
-d -
-f