Blocking certain querystring parameters

Hi There

hope someone can help with this simple-ish request

I would like to allow the page when it has just the "letter" parameter

/script.aspx?letter=A

I would like to block the page when it has letter plus any other params for example

/script.aspx?letter=A&page=2
/script.aspx?format=2&letter=B

How can I define this in my robots.txt ?

Thanks

 

Use following code:

User-agent: *
Disallow: /script.aspx?letter=*&*
Disallow: /script.aspx?*&letter=*

This would block your pages as you wish. Please do let me know if you have any further query.

 

thanks, worked perfectly

 

Your welcome