title: IPython in Jupyter notebook: recall previous command
body: <p>In the Unix shell, you press up-arrow to recall previous command. With Jupyter, so far I could only hack to achieve this behaviour with copy-and-paste through C and Shift-V shortcut, or go into previous cell and run it again, which is cumbersome. </p>
  
  <p>Is there a standard shortcut for this?</p>