How to take a screenshot on a Mac
hold down	command ⌘	and		and press	3	=	Mac OS X captures the entire screen and saves it as a file on the desktop. The file name will look like“Screen shot 2013-11-14 at 08.45.00 AM.png”.
How do I take a partial screenshot?
hold down	command ⌘	and		and press	4	=	Use your mouse to draw a rectangle in order to specify what to capture – or press the spacebar and then click on something (e.g. a window) to capture it. Mac OS X then saves it as a file on the desktop. The file name will look like“Screen shot 2013-11-14 at 08.45.00 AM.png”.
I don’t need a file. How can I have a screenshot in the clipboard instead?
hold down		together with any of the combinations above				=	Mac OS X takes a screenshot and copies it to the clipboard (instead of saving it as a file).
I guess it’s in the clipboard now. How can I paste it into a document or something?
hold down	command ⌘	and press				=	Mac OS X pastes the screenshot (that is in the clipboard) into a document or image you are currently editing.