title: git: check diff between local working copy and remote working copy
body: <p>We have to copy over files to an archaic live server for reasons I can't control so I need to see a diff of what the remote working copy will be compared to my local working copy (which is at a different base).</p>
  
  <p>What are the command lines for this? I've tried several things and they either just hang or don't give the output I need.</p>