Manyfile Processing

[user at domain.invalid]

Hey,

 sorry if i bother you with a beginners question but i have an issue
with processing a bunch of files. They are some arithmetic lists the
processing of one file is an easy task but how do i process many files?
I tried reading that files in to a list and looping over the list
elements but the function won't accept any arguments other than a string.

I would appreciate if you could help me.