title: powershell tf command not recognized as the name of a cmlet
body: <blockquote>
    <p>tf : The term 'tf' is not recognized as the name of a cmdlet,
    function, script file, or operable program. Check the spelling of the
    name, or  if a path was included, verify that the path is correct and
    try again.</p>
  </blockquote>
  
  <p>I set up the environment variable but does not work. tf command works in Developer Command Prompt for VS2013 but does not work in Powershell. How can I make this to work?</p>
  
  <p><img src="https://i.stack.imgur.com/LFbSq.png" alt="Edit System Variable dialog"></p>