title: How to revert all files in directory to older SVN version
body: <p>I want to revert the SVN files on my computer only to an older version. I don't want to commit the changes to the repository.</p>
  
  <p>I tried <code>svn merge -rCurrentVersion:revertToVersion</code>, but I get: </p>
  
  <pre><code>[root]# svn merge -r150:139
  svn: Try 'svn help' for more info
  svn: Merge source required
  </code></pre>
  
  <p>How do I do this?</p>