fsck_ffs(8) on FreeBSD
The text 3f4936d689eb, as FreeBSD 12.0-RELEASE shipped it.
file system consistency check and interactive repair
Flags it lists
-
-B -
-C -
-E -
-F -
-R -
-S -
-Z -
-b -
-c -
-d -
-f -
-m -
-n -
-p -
-r -
-y