I just want to no whether Google indexed Robot.txt file or not
Everyone below is say'n google does not crawl robot.txt but the answer is that google crawler does look for robot.txt at first place and look for instructions in it to crawl the rest of the webpages. Robot.txt is not indexed.
I don't think that Google is crawling robots.txt file or url. Because Robots.txt is a text file which is used to tell the search engine to don't crawl those pages or part of site which is mentioned on that list. Some time it happens that page is already cached or indexed by search engine before inserting in robots.txt and we think robots is not working so its a rumor and nothing
robots.txt is crawled by Google. With the help of this file only, crawler knows which pages are not allowed to crawl.
If you want only Google bot not to crawl your all pages but all other search engines should crawl, this is the code you have to write in robots.txt file:
By writing this,only Google will not crawl your website but other search engines will do.