Check_Wifi_Key.sh

#!/bin/bash

function poke {
  while true
  do
    #printf '\n'
    sleep 1
    if [ -f /dev/shm/done ]; then
      rm /dev/shm/done
      return
    fi
  done
}

function watch {
  (poke) | wpa_cli | while read line
  do
    #echo $line
    case "$line" in
      *'4-Way Handshake failed'*)
        #echo "incorrect key"
        touch /dev/shm/done
        return 0
      ;;
      *'CTRL-EVENT-CONNECTED'*)
        #echo "connected"
        touch /dev/shm/done
        return 1
      ;;
    esac
  done
}

if [ -f /dev/shm/done ]; then
  rm /dev/shm/done
fi

watch

exit $?