title: Deleting all datasets in a library
body: <p>This probably has a really simple answer. How would I go about deleting all the datasets in a library? I did something like</p>
  
  <pre><code>proc datasets library=lib;
     delete _all_;
  quit;
  </code></pre>
  
  <p>but that just tries to delete the dataset called <code>_all_</code>. Do I have to manually list all the datasets in the <code>delete</code> command?</p>