Treat files that were modified locally and remote

[Kurt]

Hi - is there a clever way to identify files that have been change on  
the local _and_ the remote location? Without such a check it may  
happen, that changes are lost without even noticing.

One way to identify such files would be to do a dry-run upsync, then a  
dry-run downsync, find files that would have been sync'ed in both dry- 
runs, and then prompt the user for some action.

Is anybody aware of a shell script doing this, or is there an other  
clever way to solve that issue?

Thanks, and best regards,
Kurt