Ignore urls in robot.txt with specific parameters?

Question

I would like for google to ignore urls like this:

http://www.mydomain.com/new-printers?dir=asc&order=price&p=3

All urls that have the parameters dir,

Answer 1

You can block those specific query string parameters with the following lines

Disallow: /*?*dir=
Disallow: /*?*order=
Disallow: /*?*p=

So if any URL contains dir=, order=, or p= anywhere in the query string, it will be blocked.