It is not clear to me what you are trying to do. The most simple way to do this is a shell script or a .bat file if there are no decisions to be made.

In general, I would recommend against putting any code that you run with eval{} into a config file. There can be very good reasons to do this, but until you understand what they are, DON'T do it. There can be big security holes with this and very unexpected results can result.

There are a number of great Perl modules that can help with this. Can you give us say 5 lines of input and what you figure those 5 lines should do?