There are many ways to copy a file in OS X. The simplest way is by control-clicking on a file (or right-clicking if you have a two-button mouse) to open up a context menu, then selecting Copy.

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You can then left click somewhere else in the window so that the file is no longer selected, control-click (or right-click with a mouse) , and select Paste Item.

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If you want to create a copy of a file or folder in the same location on your hard drive, control-click on it and then select Duplicate.

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You can also copy a file by using the options under the Edit menu in the Finder (Edit, Copy and Edit, Paste), or keyboard shortcuts (Control + C for Copy and Control + V for Paste).

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You can also hold down the Option key while dragging a file to create a copy. A plus sign will appear on the file’s icon as you drag it to let you know you are creating a copy.

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