How do you compare a stream with your sandbox

I don't see any compare with the actual files on disk.

I see stream compare against stream or workspace
and
workspace compare against stream or workspace.

the pending changes view does the synchronization compare between workspace and sandbox.

In the Eclipse client, if you right click over a file in your sandbox (e.g., in the Package Explorer or Pending Changes view), and select "Compare_with -> Remote... -> Component_in_another_workspace_or_stream", you will be able to select the stream you want to compare the sandbox file with.

There might be an equivalent command line request for this, but we'll need one of our command line gurus to comment on that.