User-agent: Baiduspider
Disallow:

User-agent: BaiDuSpider 
Disallow:

User-agent: baiduspider=Baidu
Disallow:

User-agent: Googlebot 
Disallow:

User-agent: google 
Disallow:

User-agent: Googlebot/1.0=Google.com 
Disallow:

User-agent: Yahoo! Slurp
Disallow: /

User-agent: Yahoo!+Slurp
Disallow: /

User-agent: SpiderMan =(yahoo)
Disallow: /

User-agent: alexa
Disallow: 

User-agent:*
Disallow: /