Block search bots on staging server

[BlueView1301]

I want to block bots from all of our client sites on our staging server.  Since robots.txt files can easily be copied over when moving a site to production, how can i block bots/crawlers from our staging server (at the server level), but still allow our clients to see/preview their site before launch?

[TakeshiYoung]

Robots.txt should be sufficient, but if you want to completely block them, here is a useful resource:

http://www.seomoz.org/ugc/blocking-bots-based-on-useragent