$thes_name{$fields[1]} = thes_name{$fields[1]}++;

This being a no-op, and all postincrement stuff aside, you're missing a $ before thes_name.

19:29 < ua> did anyone bother mentioning to the guy that he was missing a '$'
            in his postdec?

(No, just placing the $ there won't do what you want. The correct example has already been given.)

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