title: Node JS installation - ReferenceError: node is not defined issue
body: <p>Recently , I have installed nodejs in my window 64 bit system ,When I try to check with   command  node -v it should show version of it but it shows error </p>
  
  <pre><code>&gt; node -v
  ReferenceError: node is not defined
      at repl:1:1
      at ContextifyScript.Script.runInThisContext (vm.js:50:33)
      at REPLServer.defaultEval (repl.js:240:29)
      at bound (domain.js:301:14)
      at REPLServer.runBound [as eval] (domain.js:314:12)
      at REPLServer.onLine (repl.js:441:10)
      at emitOne (events.js:121:20)
      at REPLServer.emit (events.js:211:7)
      at REPLServer.Interface._onLine (readline.js:282:10)
      at REPLServer.Interface._line (readline.js:631:8)
  &gt;
  </code></pre>
  
  <p>I don't understand the reason. Any help would be appreciated.</p>