=====Original Message=====
>From :[EMAIL PROTECTED];
>To :John W. Krahn <[EMAIL PROTECTED]>;
>Cc :Perl Beginners <beginners@perl.org>;
>Date:Fri Apr 18 13:51:58 CST 2008
>Subject:Re: CSV duplicate
>
>I haven't seen hash used in this format.
>$data{ $val1 }{ $val2 }++; Can yor please tell what this means?
>
It's a hash with two levels of keys.
That's to say, %data is a hash, $data{$val1} refer to an anonymous hash (the
second level hash), $data{$val1}{$val2} get the second level hash's value via
the key $val2.
using Data::Dumper you will see the data stru clearly.
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