3 ways to take screenshot in OSX

 1. Press Command-Shift-3 all at once to take a screenshot of your entire screen.
2. Press Command-Shift-4 all at once and Mac OS X presents you with crosshairs you can use to select whatever portion of your display you'd like to capture in a screenshot. Just select your desired area, let up on the mouse and whatever you've highlighted will be captured.

3. Type Command-Shift-4 and then press the spacebar once. The crosshairs will change into a camera icon. Hover ...
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