====== sendsms ======

bash skript pro poslani sms pres GSM usb modem

  # cat sendsms
  #!/bin/bash
  #usage: sendsms <mobile number> <text to send>
  sm_number=${1:?"missing arg 1 for <mobile number>"}
  
  sm_text=""
  
  if [[ -p /dev/stdin ]]
      then
      sm_text=$(cat -)
  fi
  
  if [ "$sm_text x" == " x" ]
    then
      sm_text=${2:?"missing arg 2 for <text to send>"}
  fi
  
  printf "AT+CMGF=1\r\nAT+CMGS=\"$sm_number\"\r\n$sm_text\x1a" > /dev/ttyUSB3