It won't be covered in the book. The source code has to be useful for something, after all.
Larry WallIt's appositival, if it's there. And it doesn't have to be there. And it's really obvious that it's there when it's there.
Larry WallIf you're a large corporation, you can afford to pay the money to register patents, but if you're an individual like me, you can't.
Larry Wall