I don't want to use modules because i often have the feeling it was not i who wrote this program, but the one that wrote that module. So i don't use modules unless there is no other way . Furthermore i am afraid of spyware on my system.

i am afraid of spyware on my system

Every module on CPAN has the source code available for all to see.
Whilst I do understand your spyware concerns, I do not think the Perl modules are going to be the likely source...

There are horrific modules on cpan which silently do all sorts of stupid/crazy stuff to your system (often silently), provide sufficient foot guns or have other issues. The source being available means those who are capable can review before use, it doesn't mean they don't exist.