Test if the network is down

network_down.sh

#!/bin/bash

path="/tmp" # /home/pi/Documents

if [ -f "$path/pid.txt" ]; then
    echo "pid file found. Exiting..."
    exit 0
fi

echo "running" > "$path/pid.txt"

check_connection(){
        dots="$1"
        wget -q --tries=5 --timeout=5 --spider https://dns.google/ > /dev/null
        retval=$?
        if [[ $retval -ne 0 ]]; then
                wget -q --tries=5 --timeout=5 --spider https://1.1.1.1/ > /dev/null
                retval=$?
                if [[ $retval -ne 0 ]]; then
                        wget -q --tries=5 --timeout=5 --spider https://www.facebook.com/ > /dev/null
                        retval=$?
                        if [[ $retval -ne 0 ]]; then
                                echo "[$(date)] Offline$dots" >> "$path/offline-time.txt"
                                sleep 5
                                check_connection ".$dots"
                        fi
                fi
        fi
}

check_connection ""

rm -f "$path/pid.txt"

exit 0