As I can see in your script you're emptying the array and reset it for the current extracted files only @filelist=<*.txt>; .. And in the final step of each run you are making sure those files are removed unlink @filelist;

I would suggest that you re-write this script in a proper way, with some good comments.

And you don't really need to run 4 separate files ... you can write 4 subroutines to process whatever you want.

Tell us what you want to accomplish and you might get better help OR at least some good suggestions.