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screencapture is a Terminal command used to invoke the screen capture feature in Mac OS X.


To take a screenshot of the entire screen and save it to the desktop

 screencapture -S ~/Desktop/screen.jpg

To take a picture of a window, and save it to the desktop

 screencapture -iW ~/Desktop/screen.jpg

To take a screenshot of a section of the screen, and save it to the clipboard

 screencapture -ic 

Man Page Excerpt

    The screencapture utility is not very well documented to date.  A list of
    options follows.
     -c         force screen capture to go to the clipboard
     -C         capture the cursor as well as the screen. only in non-interactive modes
     -d         display errors to the user graphically
     -i         capture screen interactively, by selection or window
            control key - causes screen shot to go to clipboard
            space key   - toggle between mouse selection and
                          window selection modes
            escape key  - cancels interactive screen shot
     -m         only capture the main monitor, undefined if -i is set
     -M         screen capture output will go to a new Mail message
     -o         in window capture mode, do not capture the shadow of the window
     -P         screen capture output will open in Preview
     -s         only allow mouse selection mode
     -S         in window capture mode, capture the screen not the window
     -t<format> image format to create, default is png (other options include pdf, jpg, tiff    and other formats)
     -T<seconds> Take the picture after a delay of <seconds>, default is 5
     -w         only allow window selection mode
     -W         start interaction in window selection mode
     -x         do not play sounds
     -a         do not include windows attached to selected windows
     -r         do not add dpi meta data to image
     -l<windowid> capture this windowsid
     -R<x,y,w,h> capture screen rect
      files   where to save the screen capture, 1 file per screen

See Also