chat(8) on OpenBSD
The text a707fdd8bea8, as OpenBSD 7.3, OpenBSD 7.2, OpenBSD 7.1 shipped it.
automated conversational script with a modem
Flags it lists
-
-S -
-T -
-U -
-V -
-e -
-f -
-r -
-s -
-t -
-v