title: Git diff: is it possible to show ONLY changed lines
body: <p>I'm trying to get only new version of lines which have changed and not all the other info which git diff shows.</p>
  
  <p>For:</p>
  
  <pre><code>git diff HEAD --no-ext-diff --unified=0 --exit-code -a --no-prefix
  </code></pre>
  
  <p>It shows:</p>
  
  <pre><code>diff --git file1 file2
  index d9db605..a884b50 100644
  --- file1
  +++ file2
  @@ -16 +16 @@ bla bla bla
  -old text
  +new text
  </code></pre>
  
  <p>what I want to see is only:</p>
  
  <pre><code>new text
  </code></pre>
  
  <p>Is it possible?</p>