in reply to unzipping files with .gz extension
Is this a Perl question or are you merely dropping a line in anything that looks like water?
If Perl-related, show us what you've tried and where you're stuck... or simply follow roboticus suggestion and see what you find. If the topic is not Perl, maybe a little searching the web will work better than asking at a Perl-specific site.
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Seekers of Perl Wisdom