How are nuts taken out of the shells?!

Question: I always see all these bags of nuts that have already been shelled, such as sunflower seed, pinon, pecans, ect.....Have you ever tried to take these outta the shell??? With the exception of sunflower seed these can be hard to get out whole. How is it done that these manufacturing companies can produce bags and bags full of whole shelled nuts, how do they do it???

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Answers: I always see all these bags of nuts that have already been shelled, such as sunflower seed, pinon, pecans, ect.....Have you ever tried to take these outta the shell??? With the exception of sunflower seed these can be hard to get out whole. How is it done that these manufacturing companies can produce bags and bags full of whole shelled nuts, how do they do it???

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I'd like to know how they take the pit out of the olives.

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By machine.

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