What if an element of @need was the nul string ("")? If you want to check if you've reached the end of the array, check if you've reached the end of the array. 

last if $incr == @need;

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In reply to Re^2: Why "use of uninitialized value" warning comes? by ikegami
in thread Why "use of uninitialized value" warning comes? by sanjay nayak

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