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What are effective knife combat techniques?

Let's say that I have to defend myself and all I have is a normal-sized sharp knife. How could I maximize my combat efficiency? What would I do if I snuck up behind an intruder in my house? What are good ways to wield a knife?
Keep in mind that I don't want to do anything illegal with this information. I just want to make myself feel safer with more defensive combat knowledge. Or should I just stay back and not get involved when I'm being attacked?