ldattach(8) on OpenBSD
The text 8b77fc4a2b3f, as OpenBSD 4.7, OpenBSD 4.6 shipped it.
attach a line discipline to a serial line
Flags it lists
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-2 -
-7 -
-d -
-e -
-h -
-m -
-o -
-p -
-s -
-t