title: tmux window exit when I exit prossess in tmux window
body: <p>If I have a process like <code>rails c</code> or <code>guard</code> that I exit out of with the command exit the tmux window also exit. </p>
  
  <p>This is not very practical when I just want to restart for example the rail console. </p>
  
  <p>Can I prevent this behavior in tmux?  </p>