interactive use, the overwhelming norm ?

Hi Everyone

I am making progress learning prolog. Things are making sense as long as 
I write a database and then query it interactively.

However things seem quite a bit more complicated with non-interactive use.

Is there a simple example that takes a database file, a query file and 
writes the results to a 3rd file?

Outside of interactive use, I am struggling. Is this because the 
overwhelming "normal use" is actually interactive?

Thanks for reading