User-agent: Googlebot
Disallow:

User-agent: Bingbot
Disallow:

User-agent: Slurp
Disallow:

User-agent: DuckDuckBot
Disallow:

User-agent: Baiduspider
Disallow:

User-agent: YandexBot
Disallow:

User-agent: Sogou Pic Spider/3.0
Disallow:

User-agent: Sogou head spider/3.0
Disallow:

User-agent: Sogou web spider/4.0
Disallow:

User-agent: Sogou Orion spider/3.0
Disallow:

User-agent: Sogou-Test-Spider/4.0
Disallow:

User-agent: Exabot/3.0
Disallow:

User-agent: ia_archiver
Disallow:

User-agent: *
Disallow: /