CI Authentication via CLI

Im in the middle of writing an application that can be accessed and used via various methods, such as HTTP, Ajax, cURL, wget, and im hoping to also make it accessible when executed via the command line using php.

I was wondering if anyone has written an application that runs via CLI, that also requires authentication?

I get that if they are executing it this way, chances are they already have access to the accounts, but the passwords would be encrypted anyways.

Thanks!