gsmctl(8) on Linux
The text 07c572ac4ed3, as Debian 12 (Bookworm) shipped it.
GSM mobile phone control program
Flags it lists
-
--baudrate -
--device -
--help -
--operation -
--version -
--xonxoff -
-X -
-b -
-d -
-h -
-o -
-v