星期一, 6月 06, 2005

A robots.txt File

A robots.txt File: "Using a robots.txt File
04/25/99 by John Pollock

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This is a useful file that keeps search engines from indexing pages you do not want spidered. Why would you not want a page indexed by a search engine? Perhaps you want to display a page that shows an example of spamming the search engines. This type of page might include an example of repeated keywords, hidden tags with keywords, and other things that could get a page or an entire site banned from a search engine.
An example of such a page is on this server, it is another one of the articles here- and it talks about search engine spammers. To look at the article, see The 'Secrets' of Spamdexers.
The robots.txt file is a good way to prevent this page from getting indexed. However, not every site can use it. The only robots.txt file that the spiders will read is the one at the top html directory of your server. This means you can only use it if you run your own domain. The spiders will look for the file in a location similar to these below:
http://www.pageresource.com/robots.txt
http://www.javascriptcity.com/robots.txt
http://www.mysite.com/robots.txt
Any other location of the robots.txt file will not be read by a search engine spider, so the file locations below will not be worthwhile:
http://www.pageresource.com/html/robots.txt
http://members.someplace.com/you/robots.txt
http://someisp.net/~you/robots.txt
Now, if you have your own domain- you can see where to place the file. So let's take a look at exactly what needs to go into the robots.txt file to make the spider see what you want done.
If you want to exclude all the search engine spiders from your entire domain, you would write just the following into the robots.txt file:
Us"

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