title: Unix PATH override commands
body: <p>Let's say my <code>PATH="/usr/bin ... /root/.rbenv/shims"</code></p>
  
  <p>I have an executable (ruby) in <code>/usr/bin</code> and <code>/root/.rbenv/shims</code>. How would I make the ruby in <code>/root/.rbenv/shims</code> be called?</p>