Robots.txt file

How do I do this...

[lizzie]

I have a subdirectory I only want Google to see.
I have another subdirectory I want to keep all spiders out of.
1.How do I write the robots.txt file?
2.Do I put it in the main directory or in
each subdirectory it applies to?

[Xoc]

See this link for the answer to all your questions:

[searchengineworld.com...]