The OP copied the lines for the open calls that I provided -- but skipped the rest of the script. Granted I missed the check on the readdir, but I also noted that (and at least failure there would just mean that @files would be empty, rather than trying to alter files in the wrong directory).

I had hoped that the OP would see what was intended with the advice given, but I think that's too much to ask. I was toying with the idea of completely revising the script (I have a current script that's taking a very long time to execute, so have some downtime while I wait for it) but I think it would be rather pointless.