Script to update folder content based on a rev file

Hey, I'm trying to figure out how to get PS to update a folder's content if the rev file on the remote share is different.

Here' s the basic logic:

1. Get current rev (from a text file called Rev #.txt, where # is the number). 

2. Get new rev from a remote share (\\sharename\Rev #.txt)

3. If rev on the remote share is newer, copy the content from the remote share to the current folder.

4. Done.

Any help is much appreciated. Thanks!