Do I have to combine for example a YAML cfg file (writing to a hash) and use the package Getopt::Long functionality overwriting these hash values?
Nope, you could also combine Config::General and do your own command line processing. Or do everything yourself. There are many ways to skin a cat in Perl!

I'd combine Config::General with Getopt::Long, but that's just because I know both modules.

In reply to Re: reading default configuration parameters from file and overriding these parameter values on command line by JavaFan
in thread reading default configuration parameters from file and overriding these parameter values on command line by spikkie

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