Make sure your system's `mail` command is configured to send emails. You might need to install and configure `postfix` or `sendmail`.
Copy the script, save it as a `.sh` file (e.g., `notifier.sh`), make it executable (`chmod +x notifier.sh`), and then set up a cron job to run it regularly (e.g., `crontab -e`).
Example cron job for running every 5 minutes: `*/5 * * * * /path/to/your/notifier.sh`