because I can't answer yet to this question: How to update product position (number) in specific category programmatically, because of my reputation. Hereby a new question about the updates for the position of a single category.
How would you only update products in that category with a curtain position, for example position 0. So only products with position 0 will change to the new number and products with position 10 will keep there position.
Hope someone can help.