title: Ant task to compare two properties files
body: <p>Does anyone know of an Ant task that would compare two (Java) properties files? I could not find any but I would like to be sure before I go off and implement it.</p>
  
  <ul>
  <li><strong>Input</strong>: two properties files</li>
  <li><strong>Output</strong>: list of property keys that are in one file but not in the other.</li>
  </ul>
  
  <p>Just to be clear: it should perform properties-file-syntax-aware comparison, comparing the existence of keys, but ignoring the values.</p>