I want to make it platform independent
...
it seems to work on both Linux and Windows

You know, "platform independent" means a bit more than just "Linux" and "Windows".

Of course, you could do worse. For some, "platform independent" means it runs on both Redhat and Debian.

And if it really has to work on "every operating system", doing it in Perl may not be your right choice. Perl itself doesn't run on "every operating system". But then, I don't think you really have an urge to run your code on your car or dishwasher.