title: Delete line containing one of multiple strings
body: <p>I have a text file and I want to remove all lines containing the words: <code>facebook</code>, <code>youtube</code>, <code>google</code>, <code>amazon</code>, <code>dropbox</code>, etc.</p>
  
  <p>I know to delete lines containing a string with sed:</p>
  
  <pre><code>sed '/facebook/d' myfile.txt
  </code></pre>
  
  <p>I don't want to run this command five different times though for each string, is there a way to combine all the strings into one command?</p>