Mac OS X offers several options to capture all or part of your screen:
- Press Command + Shift + 3 to take a picture of the whole screen
- Press Command + Shift + 4 and drag the gray box to select the part of the screen that you want to capture
The picture is saved as a TIFF file on your Desktop, generally called Picture 1, Picture 2, etc.
If you want to copy the screen capture to the Clipboard instead of saving it as a file, simply:
- Press Control + Command + Shift + 3 to copy the entire screen to the Clipboard
- Press Control + Command + Shift + 4 to copy the selected range to the Clipboard