title: Disable messages upon loading a package
body: <p>I have a package in R (ROCR) that I need to load in my R environment.  Upon loading the package, a set of messages are printed.  This is ordinarily fine, but since the output of my R script is being used for further analysis I want to completely disable all of this output.  How do I do that?  Furthermore, I'd prefer to do it without having to modify ROCR at all, so that future users of this script don't have to do that either.</p>
  
  <p>So far:</p>
  
  <ul>
  <li><code>sink()</code> doesn't work here - redirecting both stdout and std err to <code>/dev/null</code> does nothing for me.</li>
  <li>Unsurprisingly, <code>options(warnings=-1)</code> does nothing either, since these are not warnings, per se, being printed.</li>
  </ul>
  
  <p>Any thoughts?</p>