title: Ignoring a directory using ack's .ackrc
body: <p>I'm not sure what it's for, but the code I'm working on has a bunch of folders called "save.d," it looks like they're used for some sort of version control (we also have .svn folders).</p>
  
  <p>How can I update my .ackrc file to ignore those directories by default?</p>
  
  <p>My .ackrc is currently</p>
  
  <pre><code>--type-set=inc=.inc
  --ignore-dir=pear
  --type-set=tpl=.tpl
  </code></pre>
  
  <p>Our folder structure can look like:</p>
  
  <pre><code>program/parsers/save.d
  program/modules/save.d
  </code></pre>