Ubuntu restart WiFi service automatically

checkwifi.sh

#!/bin/bash

# sudo crontab -e
# @reboot /home/dizcza/Programs/checkwifi.sh
# sudo update-rc.d cron defaults

/bin/sleep 30

while true; do
  /usr/bin/wget -T5 -q --spider google.com
  code=$?
  /bin/echo "$(date +'%D %H:%M:%S') code ${code}" >> /home/dizcza/checkwifi.log
  if [ ${code} -ne 0 ]; then
    /usr/bin/nmcli radio wifi off
    /bin/sleep 5
    /usr/bin/nmcli radio wifi on
    /bin/sleep 10
    /usr/sbin/service network-manager restart
    /bin/echo "RESTARTED ${code}" >> /home/dizcza/checkwifi.log
  fi
  /bin/sleep 20
done