Webpage monitor

readme.md

Webpage monitor

Monitors a web page for changes every 30min then sends an email notification if the file changes.

Start

Start with nohup

nohup sh webpage_monitor.sh > nohup.log 2>&1 &

Get PID

echo $! > save_pid.txt

Read live log

tail -f nohup.log

Kill process

kill `cat save_pid.txt`
rm save_pid.txt

message.txt

Hello,

This page has changed:

https://www.domain.tld/example/of/a/url/

See yah !

webpage_monitor.sh

#!/bin/bash

# Monitors a web page for changes every 30min
# sends an email notification if the file change

URL="https://www.domain.tld/example/of/a/url/"
SEARCH="element to observe"

while true; do
    mv new.html old.html 2> /dev/null
    curl $URL -L --compressed -s | grep -c "$SEARCH" > new.html
    DIFF_OUTPUT="$(diff new.html old.html)"
    if [ "${#DIFF_OUTPUT}" != "0"  ]; then
        mail -s "Mail subject" [email protected] < message.txt
    fi
    sleep 30m
done