A very small script which compares the state of URLS based on md5. If the state changes, you can run an action - whatever you like basically.

• bash
• curl
• sed
• md5sum
• diff

Place the files inside a folder. Edit pages according to your needs, each line represents a page.

page-url|regex

The page-url is simply the url. The regex is passed to sed to replace some things on the website before calculating the checksum - like a date-tag or something.

When you actually want to do something, create the file action.sh - this will receive following arguments:

• Page-url which changed $1
• Output of diff $2

Add a cronjob to your system to run main.sh based on an interval.