title: How to delete a line that contains the dot character using sed
body: <p>I try to delete from a text file lines that contain the <code>.</code> character.</p>
  
  <p>I try this command, but it does not work:</p>
  
  <pre><code>sed '/./d' input.txt &gt; output.txt
  </code></pre>
  
  <p>Any ideas?</p>