The default way to capture your screen to a file is to press the PrintScreen key. The program ksnapshot will pop up. It allows you to capture
However many people want their screenshots to be stored without any further interaction. This can be useful during documentation work when you want to do a lot of screenshots without interrupting work. One solution is to set up Shift_PrintScreen to trigger a screenshot. To do this
yast -i ImageMagick
import -window root "snapshot-$(date --rfc-3339=seconds).jpg"
Now whenever you press Shift_PrintScreen your screen will be saved to your home folder with a timestamp in its name, e.g. snapshot-2014-08-05 10:06:09+02:00.jpg