setextattr(8) on FreeBSD
The text b4eed8a38b6d, as FreeBSD 13.2-RELEASE, FreeBSD 13.1-RELEASE, FreeBSD 13.0-RELEASE shipped it.
manipulate extended attributes
Flags it lists
-
-f -
-h -
-i -
-n -
-q -
-s -
-x