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: Exabot
Disallow:

User-agent: *
Disallow: /