I recently discovered the beauty of the "whois" script:
whois example.com | grep 'Registry Expiry Date'
I'm trying to keep up with a domain that's in its redemption period right now, and from my experience it could become available any day now! And it's a fight to get it before a squatter that will try to sell it to me for $150 bajillion or something.
If I write a bash script that uses whois to email me when it comes available, how often can I make it run without getting myself in trouble?