robots.txt to disallow all pages except one? Do they override and cascade?

Question

I want one page of my site to be crawled and no others.

Also, if it\'s any different than the answer above, I would also like to know the syntax for disallowing ever

Answer 1

you can use this below both will work

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

or

User-agent: *
Allow: /index.php
Disallow: /

the Allow must be before the Disallow because the file is read from top to bottom

Disallow: / says "disallow anything that starts with a slash." So that means everything on the site.

The $ means "end of string," like in regular expressions. so the result of Allow : /$ is your homepage /index