The hash has not doubled. Rather, $var1 = undef is the key to the first hash element, $var2 = 'h20' is the value of the first hash element, etc.
The good news is, this verifies the problem. That is, your keys are empty. Please show us the content of the text file you are using. That will certainly help us help you resolve the problem.
davidj
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Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
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Snippets of code should be wrapped in
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Want more info? How to link
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