title: mv command failing because destination already exists
body: <p>Sorry if this has been answered - I tried to search, but didn't find anyone with quite the same issue..  </p>
  
  <p>I'm trying to basically move all files from one drive (mountpoint) to another..  I initially used </p>
  
  <p>mv /mnt/old1/* /mnt/disk1</p>
  
  <p>This SEEMS to have been working, but I had a power failure in the middle of it, and when I re-issue the command, it seems to be having issues because the directory structure in the destination already exists, so it's not moving the source files anymore.</p>
  
  <p>Basically, at this point, I'm just trying to merge two directory structures into one.  I guess I could cp the structure, but I would really have no way to know if a file was skipped as I do with mv, since if it's still in the source drive, I can assume it wasn't moved..</p>
  
  <p>Is there a better way to do this?  I've never used rsync, but from what I'm reading, perhaps this is a better option?</p>
  
  <p>Any help would be greatly appreciated - I've got millions of files (18+tb) to move and I don't want to inadvertently miss something..</p>
  
  <p>Thanks!
  Steve</p>