title: which version of program will execute? the one in the /usr/bin or the one in /usr/local/bin?
body: <p>I have python in both <code>/usr/bin</code> and <code>/usr/local/bin</code>. Now I have this question that which one will execute if I call python?</p>
  
  <p>I know that I can check with <code>which python</code> command to see which one is which one. But I'm asking which one would work by default? </p>