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A question mark is a special character in Linux. In bash, it can match any character, but it’s also used as a wildcard. The question mark, also known as “%”, is typically used in filenames to match arbitrary strings of characters. In the same way that asterisks match zero or more characters, the question mark …

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If you are considering upgrading your Mac’s operating system, you are probably wondering, Does MacOS Catalina cost money? If so, then you’re in luck. This advanced version of the desktop operating system is available for free as a software update. Upgrading is easy, and you can get an upgrade for as little as $29, or …

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