title: How do I get git to ignore my csv files?
body: <p>I want git to ignore my csv files.  But, when I do <code>git status</code>, I see that the csv is in <code>"Changes not staged for commit"</code>.  But, I swear I added it to the .gitignore file a while ago.  In fact, when I look at the <code>.gitignore</code> file, I see that it is there!</p>
  
  <pre><code>*.csv
  </code></pre>
  
  <p>So, how to I get <code>git</code> to ignore my csv's?  The problem is that I want to be able to do <code>git reset</code> and <code>git checkout</code> without having to worry about the <code>csv</code> files being overwritten in my working directory.  </p>