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In our Joomla projects we found out that the following robots.txt configuration excludes all of the Joomla default folders that do not need to be indexed by default:
User-agent: * Disallow: /administrator/ Disallow: /cache/ Disallow: /cli/ Disallow: /components/ Disallow: /images/ Disallow: /includes/ Disallow: /installation/ Disallow: /language/ Disallow: /libraries/ Disallow: /logs/ Disallow: /media/ Disallow: /modules/ Disallow: /plugins/ Disallow: /templates/ Disallow: /tmp/ Disallow: /cgi-bin/ Disallow: /stats
We normally have a very narrow robots.txt setup in Typo3 which looks like this
User-agent: * Disallow: /Proselect/ Disallow: /fileadmin/templates/ Disallow: /typo3/ Disallow: /t3lib/ Disallow: /typo3conf/ Disallow: /typo3temp/
To install a robots text just copy/paste the above code lines into a textfile and name it - robots.txt
Copy that file to your web projects' public html root folder and try to fetch the file by entering the URL to it in the browser:
http://yourdomain.com/robots.txt
If you can see the text in the browser you're all set!