Auto grab content - PHP Cronjob

I need you to make a .php script that will run as a cronjob. The script will go to an url and grab all content (domain names), then it will send the results to a .txt file on the server. It needs to have a duplicate check builtin, and a simple validator to make sure its a correct domain name ( [login to view URL] ) Max 40 bucks. Demo needs to show all functions, then i pay, and you deliver the script. PM for URL.