title: node -v and nodejs -v shows different versions
body: <p>node -v and nodejs -v shows different versions</p>
  
  <p>My node -v shows
  4.2 version 
  and nodejs -v
  shows 6.10.3</p>
  
  <p>So what should be the issue?
  I want node -v to show 6.10.3.</p>