Thanks Tanget !! I have tried changing my %count = (); to my %count; and loop part i didnot understand. I thought $device is somthing which we are looking in both the arrays or it's just any x value ? 
DEBUG( "DEBUG Difference:\n");
DEBUG( "DEBUG: - $_\n for @difference" );
DEBUG( "DEBUG: - Intersect:\n ");
DEBUG( "DEBUG: - $_\n for @intersect )";
DEBUG( "DEBUG: - Union:\n ");
DEBUG( "DEBUG: - $_\n for @union " );

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I am still getting the same error ...

In reply to Re^2: compare 2 arrays for intersect diff and commmon values by rasgolla
in thread compare 2 arrays for intersect diff and commmon values by rasgolla

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