If you want to read the whole file into a string, then you should read in one go instead of reading it piece by piece and growing the string. This is done by setting $/ to undef and reading from the filehandle. The standard idiom is: 
my $test = do { local $/; <$filename> };

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In reply to Re: Problems with uploading a file from a web form by iburrell
in thread Problems with uploading a file from a web form by ezekiel

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