iterate folder and sub folders change attribute

Hi

I need to iterate a folders files and change every files attribute, if the folder has sub folders they should also be processed, can anyone show how to do this?

See these 3 articles to get you where you need to go.

Files and Folders Part 1-3

technet.microsoft.com/en-us/library/ee176983.aspx
technet.microsoft.com/en-us/library/ee176985.aspx
technet.microsoft.com/en-us/library/ee176988.aspx

For attributes see this:
Use a PowerShell Cmdlet to Work with File Attributes - Scripting Blog