lock(1) on OpenBSD
The text e17e4e5dd5ed, as OpenBSD 5.0, OpenBSD 4.9, OpenBSD 4.8, OpenBSD 4.7, OpenBSD 4.6, OpenBSD 4.5, OpenBSD 4.4, OpenBSD 4.3, OpenBSD 4.2 shipped it.
reserve a terminal
Flags it lists
-
-a -
-n -
-p -
-t