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The command shell is the most common command on a Linux system. It’s also the default shell on macOS. When you create your account on a Linux system, you’ll probably be given the option of using bash or csh as the default shell. You can change this with the chsh command. See Chapter 3 for …

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Does Ubuntu require a licence? That’s a question that many people have. But it’s not so simple to answer. Ubuntu is a free open source operating system, and you can download and install it for free. Unlike most free software, Ubuntu does not require a license. This means that you can share it, distribute it, …

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