ok, so command+shift+4 does screenshot...

[orijinal]

but what does command+shift+ctrl+4 do?

it brings up the same crosshair for selecting, and allows you to still crop a part of the screen, but after the cropping, nothing happens.

what's the purpose of this?

 

[HexMonkey]

It puts the screenshot on the clipboard.

See the Screenshots guide for more information.

 

[joecool85]

I thought what it did was do a screen shot of only what you select.

 

[ChrisFromCanada]

Try just command + Shift + 4. This will place a .png file of your screenshot on the desktop.

 

[Laser47]

CMD+Shift 3=Whole Screen Shot
CMD+Shift 4=Selective Screenshot
CMD+Shift 4, Then press Space=Selective App Screenshot.

 

[killmoms]

CMD+Shift 3=Whole Screen Shot
CMD+Shift 4=Selective Screenshot
CMD+Shift 4, Then press Space=Selective App Screenshot.

Adding Ctrl to any of these sends the shot you take to the clipboard instead of the desktop as a PNG.

 

[Jay42]

Never knew about the CMD-Shift-4 then Space deelee.