How to take screenshots with your Raspberry PI?

• install a package called ‘scrot’:
  sudo apt-get install scrot
  

• take a screen shot of the entire screen:
  sudo scrot
  

• select the area for the screenshot with the mouse:
  sudo scrot -s
  

• take a screenshot after 20 seconds:
  sudo scrot -d20

• see more options:
  sudo scrot -h