File not Closed
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I was just frogging up a little utility for myself. It opened all the files in a directory. As I was just writing it, that's all it did.
I went to delete all the files in the directory. Six of them were "in use" and could not be deleted. They were "in use" by my little utility stub, though that had run to completion.
Moral: explicitly closing files is not just a good habit.
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