title: Set path for a specific command under OSX
body: <p>I have <em>libtool</em> command in both path :</p>
  
  <pre><code>/opt/local/libexec/gnubin/libtool
  </code></pre>
  
  <p>and </p>
  
  <pre><code>/usr/bin/libtool
  </code></pre>
  
  <p>The current command is recognized under macport which is the first path. 
  What can I do if I want the command <em>libtool</em> run from <em>/usr/bin/libtool</em> without removing the macport path?</p>