The Option (⌥) key – or Alt key, depending on your keyboard layout – can be used to unlock all kinds of features hidden in your Mac’s operating system.
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Try holding it down next time you access an app’s menu bar options, for instance, and you’ll often see several tweaked actions available to you.
Additional Finder File actions revealed via the Option key
In the Finder File menu shown above, Open becomes Open and Close Window (if you have a file selected in Finder, selecting this opens the file and also closes the Finder window), Close Window becomes Close All, and Move to Trash becomes Delete Immediately, amongst other options.
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