A simple script to watch a url for changes

url-watcher.sh

#!/bin/bash
URL="$1"
TOKEN="Telegram Bot Token"
CHAT_ID="Your Chat ID" # for example use @myidbot
temp_file=$(mktemp)
curl -o $temp_file "$URL"
sum=$(md5sum $temp_file)
while :
do
        sleep 3600
        curl -o $temp_file "$URL"
        sum2=$(md5sum $temp_file)
        if [[ "$sum" != "$sum2" ]]; then
                curl -X POST -d text="$URL" -d chat_id=$CHAT_ID https://api.telegram.org/bot$TOKEN/sendMessage
                rm $temp_file
                exit
        fi
done