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salam every one, this is a topic from google web master centrale blog:
We all know how friendly Googlebot is. And like all benevolent robots, he listens to us and respects our wishes about parts of our site that we don't want crawled. We can just give him a robots.txt file explaining what we want, and he'll happily comply. But what if you're intimidated by the idea of communicating directly with Googlebot? After all, not all of us are fluent in the language of robots.txt. This is why we're pleased to introduce you to your personal robot translator: the Robots.txt Generator in Webmaster Tools. It's designed to give you an easy and interactive way to build a robots.txt file. It can be as simple as entering the files and directories you don't want crawled by any robots.  Or, if you need to, you can create fine-grained rules for specific robots and areas of your site. 
The Robots.txt Generator creates files that Googlebot will understand, and most other major robots will understand them too. But it's possible that some robots won't understand all of the robots.txt features that the generator uses.
Although it's highly unlikely from a major search engine, there are some unscrupulous robots that may ignore the contents of robots.txt and crawl blocked areas anyway. If you have sensitive content that you need to protect completely, you should put it behind password protection rather than relying on robots.txt. We hope this new tool helps you communicate your wishes to Googlebot and other robots that visit your site. If you want to learn more about robots.txt files, check out our Help Center. And if you'd like to discuss robots.txt and robots with other webmasters, visit our Google Webmaster Help Group.this is a topic published in 2013... to get contents for your blog or your forum, just contact me at: devnasser@gmail.com
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Labels: crawling and indexing, webmaster tools
