lockf(1) on macOS
The text 54b7649e7ba1, as macOS 14.6, macOS 14.5, macOS 14.4, macOS 14.3, macOS 14.2, macOS 14.1, macOS 14.0, macOS 13.5, macOS 13.4, macOS 13.3, macOS 13.2, macOS 13.1, macOS 13.0 shipped it.
execute a command while holding a file lock
Flags it lists
-
-k -
-n -
-s -
-t -
-w