Adding multiple role assignments all at once

Is there a way to add multiple role assignments to a report definition all at once?

Instead of going to the Report Manager, selecting each individual report definition, and then clicking on "New Role Assignment" multiple times to add users, is there a way to add multiple users all at once?

You can write a script and use rs.exe.

Here is a pointer to the tool. There should also be information for example scripts.

http://msdn2.microsoft.com/en-us/library/ms162839.aspx