OS X run bash command as another user with sudo privileges
<p>I have root access in my terminal and I am trying to run a command as another user with sudo privileges and I can't make it work.</p>

<p>Here is the scenario:</p>

<p>I am logged in as root and I want to execute <code>sudo echo hello world</code> as the user <code>javier</code>. </p>

<p>I currently have <code>sudo -u javier sudo echo hello world</code> but it prompts for a password.</p>

<p>Is there a way of running this without it prompting for a password?</p>