What is the easiest way to turn a Linux CLI program into a basic Web app?

I have a Linux command line program that takes data from 2 ascii files and writes data into a third ascii file - all defined as parameters. I want to create a most basic Web app that would upload two files and return/display the result. No logic whatsoever, just to pass the input and display the output, whatever it is, nothing if no file is created.

How can I do that in a jiffy, without learning too much?