title: How do I switch between active docker-machines on OSX?
body: <p>Within MacOS, I have created 2 docker machines, say, dev1 and dev2. 
  In one terminal running <code>$docker-machine active</code> shows dev1 as an active docker-machine and in the other, dev2. Now I want to switch to dev2 in the 1st terminal (without stopping/removing etc. dev1) so that I'll have dev2 in both. </p>
  
  <p>How do I do this? Thanks!   </p>