Linux Double Quotes

A lot of people believe in working long days and doing dou­ble, triple, or even quadruple shifts. I'm not one of them. Neither Transmeta nor Linux has ever gotten in the way of a good night's sleep. In fact, if you want to know the honest truth, I'm a firm believer in sleep. Some people think that's just being lazy, but I want to throw my pillow at them. I have a perfectly good excuse, and I'm standing by it: You may lose a few hours of your produc­tive daytime if you sleep, oh, say, ten hours a day, but those few hours when you are awake you're alert, and your brain functions on all six cylinders. Or four, or whatever.

You can use rm -rf dir to delete a directory and its contents, but be careful! This is one of the few commands that can do serious damage, especially if you run it as the superuser. The -r option specifies recursive delete to repeatedly delete everything inside dir, and -f forces the delete operation. Don’t use the -rf flags with globs such as a star (*). And above all, always double-check your command before you run it.