gsmsendsms --version (return code: 0)
gsmsendsms: version 1.10 [compiled Aug 15 2015]
gsmsendsms --help (return code: 0)
gsmsendsms: [-b baudrate][-c concatenatedID][-C sca][-d device][-h][-I init string]
[-t][-v][-X] phonenumber [text]
-b, --baudrate baudrate to use for device (default: 38400)
-c, --concatenate ID for concatenated SMS messages
-C, --sca SMS service centre address
-d, --device sets the destination device to connect to
-h, --help prints this message
-I, --init device AT init sequence
-r, --requeststat request SMS status report
-t, --test convert text to GSM alphabet and vice
versa, no SMS message is sent
-v, --version prints version and exits
-X, --xonxoff switch on software handshake
phonenumber recipient's phone number
text optional text of the SMS message
if omitted: read from stdin