Apple OS screen capture commands (Mac shortcuts)

Here are keyboard commands to capture screenshots on an Apple computer:

Key Combination	Result
Command+Shift+3	Capture entire screen and save as a file
Command+Control+Shift+3	Capture entire screen and copy to the clipboard
Command+Shift+4	Capture dragged area and save as a file
Command+Control+Shift+4	Capture dragged area and copy to the clipboard
Command+Shift+4 then Space bar	Capture a window, menu, desktop icon, or the menu bar and save as a file
Command+Control+Shift+4 then Space bar	Capture a window, menu, desktop icon, or the menu bar and copy to the clipboard

One handy trick to know about when using the dragging methods (Command+Shift+4) is how the cursor crosshairs work:

To delineate an exact pixel region, the cursor crosshairs should overlap the top and left edges of the area you want to capture, but extend one pixel below and to the right of it. This technique works with the selection crosshairs in other applications as well.

 
From  http://oreilly.com/digitalmedia/2006/01/01/mac-os-x-screenshot-secrets.html



This can NOT capture cursor, for that you need the Grab Utility.

Mac OS X  ships with the Grab utility, located in the Applications - Utilities folder. To use Grab, double-click on its icon and choose the type of image you want to capture.


Figure 3. Using Grab for screen capture.

Grab supports three modes of screen capture:

    Selection: Select the region you want to capture using the mouse
    Screen: Capture the entire screen
    Timed Screen: Capture the entire screen after a specific time interval