auto reconnect wifi after kick out by router on ubuntu

wifi_watch_dog.sh

#!/bin/bash
check_internet_connection() {
  return $(ping -c 1 www.baidu.com > /dev/null)
}

SSID=$1
PW=$2

while [ 1 ]; do
  check_internet_connection
  # already have internet connection
  if [ $? -eq 0 ]; then
    sleep 10
  else
    echo "$(date +%Y-%m-%d\ %H:%M:%S) lost internet connection, auto reconnect..."
    nmcli conn show --active
    nmcli con down $(nmcli conn show --active|grep wifi|awk '{print $(NF-2)}')
    nmcli device wifi connect $SSID password $PW
    nmcli conn show --active
    sleep 5
  fi
done