Non-interactive swiprolog queries from the shell

Hello everyone,

I started building the left hemisphere of my robot's brain with swi-prolog 
and I'm stuck on probably a very basic thing as I haven't touched prolog since uni. I want to execute/pass/pipe/whatever queries into 
swi-prolog from the GNU/Linux shell and save/use the results. I can run any shell command via the shell itself or python but do you have any ideas on how/what 
should I run (syntax) to e.g. have swi-prolog use a specific file with my 
stored rules or whatever (complied I guess) and pass the query like an 
argument or input? Actually, is this possible at all?

So, non-interactive queries from the command line is what I'm looking for here.

I hope I didn't confuse you!

Thank you,

Antonios A.