How can I get the historical data of stocks being ranked in Zacks Investment?

I dont think a deep implementation like what you suggest (command line tools or API calls) is needed for this purpose.

Just head over to finance.yahoo.com and you ll be able to get historical data, or export them as CSV if you want to process them, through its interface. (if you need something more extreme than just a quick look, an API is also offered to programmatically query)

EDIT: If you need the specific web content, as in the recommendations given by them on specific dates, you can use a service like http://web.archive.org/ to check the site's content during that time. Doubt anyone will have extensive archives at hands for the specific site's recommendations per se, so I think that's the best shot you have.