trim(8) on FreeBSD
The text 9cd1ac81e43f, as FreeBSD 13.2-RELEASE, FreeBSD 13.1-RELEASE, FreeBSD 13.0-RELEASE shipped it.
erase device blocks that have no needed contents
Flags it lists
-
-N -
-f -
-l -
-o -
-q -
-r -
-v