I want to block search bots in crawling all my website's pages expect for homepage. Is this rule correct?

[esiow2013]

User-agent: *

Disallow: /*

[Travis_Bailey]

I don't think that will work. Robots.txt doesn't handle regular expressions. You will have to explicitly list all of the folders, and files to be super sure, that nothing is indexed unless you want it to be found.

This is kind of an odd question. I haven't thought about something like this in a while. I usually want everything but a couple folders indexed. : ) I found something that may be a little more help. Try reading this.

If you're working with extensions, you can use **Disallow:/*.html$ **or php or what have you. That may get you closer to a solution.

Definitely test this with a crawler that obeys robots.txt.

[MattAntonino]

Actually, there are two regex that Robots can handle - asterisk and $.

You should test this one.  I think it will work (about 95% sure - tested in WMT quickly):

User-agent: *
Disallow: /
Allow: /$

[Kingof5]

Use this:

User-agent: Googlebot
Noindex: /

User-agent: Googlebot
Disallow: /

User-agent: *
Disallow: /

This is what I use to block our dev sites from being indexed and we've had no issues.

[esiow2013]

Thanks David! Will try this one.

[esiow2013]

Thanks Matt! I will surely test this one.

[GPainter]

some great answers you can also find a list of all the robots here & here  

Depending on your site you can also for example hide the rest of your site behind a login screen or a form which bots won't fill in.