Small program to download a web page, see if a string appears in it and send email if it does.
Grab https://www.cloudflare.com/ and see if it contains "Breaking News" and send email if it does.
webwatch -url=https://www.cloudflare.com/ -warn="Breaking News" -from=alice@example.com -to=bert@example.com
-url: URL to get
-warn: string to search in the page
-from: From address for the email
-to: List of comma-separated addresses to send mail to
-smtp: The SMTP server to use