atinout
AT commands as input are sent to modem and responses given as output.
This program will read a file (or stdin) containing a list of AT
commands. Each command will be send to the modem, and all the response
for the command will be output to file (or stdout).
Example, to hang up any ongoing call:
$ echo ATH | atinout - /dev/ttyACM0 -
ATH
OK
$