So you want sorting based on comparison of ITEM1, 2, and 3 in that order? Try: 
@sorted = sort { $hash{$a}{ITEM1} <=> $hash{$b}{ITEM1} ||
                 $hash{$a}{ITEM2} <=> $hash{$b}{ITEM2} ||
                 $hash{$a}{ITEM3} <=> $hash{$b}{ITEM3} }
                 keys %hash;

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Code is (almost) always untested.
http://www.justicepoetic.net/

In reply to Re: Sorting a hash by 3 different keys by jweed
in thread Sorting a hash by 3 different keys by Ineffectual

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