@SortedArrayOfHashes = sort 
			{ 
			return $a->{'key1'} cmp $b->{'key1'} or  # if these are equal try the comparison below
					$a->{'key2'} cmp $b->{'key2'} or # if these are equal try below
					$a->{'key3'} cmp $b->{'key3'} #if these are equal, then we give up; they're the same.
			}
			@ArrayOfHashes;