> Another trick is based on the fact that the link count of a directory is 2 + the number of subdirectories. For anyone who doesn't know why this is, it's beca

> Another trick is based on the fact that the link count of a directory is 2 + the number of subdirectories. For anyone who doesn't know why this is, it's because when you create a directory it has 2 hard links to it which are dirname dirname/. When you add a new subdirectory it adds one more link which is dirname/subdir/.. So each subdirectory adds one more to the original 2.