title: What does 1c1 in diff tool mean?
body: <p>I ran diff with two files and got the following output:</p>
  
  <pre><code>1c1
  &lt; dbacaad
  ---
  &gt; dbacaad
  </code></pre>
  
  <p>What does this mean? My two files seem to be exactly the same.
  Thank you very much!</p>