Using sed to replace multiple lines in multiple files

Question

I have thousands of html files in which there are two different pieces of old google adsense code which needs to be replaced by new ones. The files are on a linux server.

the old code looks like:

  <script type="text/javascript"><!--
google_ad_client = "pub-xxx";
google_ad_width = 336;
google_ad_height = 280;
google_ad_format = "336x280_as";
google_ad_type = "text";
//2007-06-09: Forum archive rectangle
google_ad_channel = "1013717472xx";
google_color_border = "FFFFFF";
google_color_bg = "FFFFFF";
google_color_link = "0000FF";
google_color_text = "000000";
google_color_url = "000000";
//-->
</script>
<script type="text/javascript"
  src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
</script>

I need to match this text "google_ad_channel = "1013717472xx"" within the code, replace the whole code with new one.

the new code is as follows:

<script src="https://pagead2.googlesyndication.com/pub-config/r20160913/ca-pub-xxx.js"></script><script src="http://pagead2.googlesyndication.com/pub-config/r20160913/ca-pub-xxx.js"></script><script type="text/javascript"><!--
google_ad_client = "pub-xxx";
/* frm arch linkunit 200x90, created 5/30/08 */
google_ad_slot = "0112084554";
google_ad_width = 200;
google_ad_height = 90;
//-->
</script>
<script type="text/javascript" src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
</script>

How can I use sed to do the replacement in all the html files on my server?

Thank you in advance!

Answer 1

ls |xargs sed -i 's/google_ad_channel = "1013717472xx"/google_ad_channel = "new_code"/g'