Beginner: how to use gedcom parser

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Hi,

I am beginner with Ruby and I would like to use gedcom parser.
First, I install it with gem install gedcom.
The documentation is not very useful for me since I don't where to
begin.
I tried examples from
https://github.com/jslade/gedcom-ruby/tree/master/samples but theses two
samples don't work.
Does anyone could give me a simple example to start?

Thank you very much
FranÃ§ois