Robots.txt file for an SMF forum

To reduce the duplicate content issue with your SMF forum and the Google index (or any search engine) you should include the lines below (between the dashes) into your Robots.txt file. This will block all pages which can be considered duplicate from getting into a search engine index and/or get removed if already added.

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User-agent: *
Disallow: /forum/index.php?action=activate
Disallow: /forum/index.php?action=admin
Disallow: /forum/index.php?action=arcade
Disallow: /forum/index.php?action=calendar
Disallow: /forum/index.php?action=collapse
Disallow: /forum/index.php?action=deletemsg
Disallow: /forum/index.php?action=editpoll
Disallow: /forum/index.php?action=help
Disallow: /forum/index.php?action=helpadmin
Disallow: /forum/index.php?action=lock
Disallow: /forum/index.php?action=login
Disallow: /forum/index.php?action=logout
Disallow: /forum/index.php?action=markasread
Disallow: /forum/index.php?action=mergetopics
Disallow: /forum/index.php?action=mlist
Disallow: /forum/index.php?action=modifykarma
Disallow: /forum/index.php?action=movetopic
Disallow: /forum/index.php?action=notify
Disallow: /forum/index.php?action=notifyboard
Disallow: /forum/index.php?action=pm
Disallow: /forum/index.php?action=post
Disallow: /forum/index.php?action=profile
Disallow: /forum/index.php?action=register
Disallow: /forum/index.php?action=removetopic2
Disallow: /forum/index.php?action=reporttm
Disallow: /forum/index.php?action=search
Disallow: /forum/index.php?action=sendtopic
Disallow: /forum/index.php?action=splittopics
Disallow: /forum/index.php?action=stats
Disallow: /forum/index.php?action=sticky
Disallow: /forum/index.php?action=trackip
Disallow: /forum/index.php?action=unread
Disallow: /forum/index.php?action=unreadreplies
Disallow: /forum/index.php?action=who
Disallow: /forum/Themes/

Disallow: /forum/*.msg
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/forum/ should be replaced with the path to your forum

What is a robots.txt file:
http://www.robotstxt.org/wc/robots.html