[p4] Sync without copying

[Dave Lewis]

  > 
  > I'm trying to find where I've seen how you can do a sync without actually doing
  > a copy, assuming that you have all the updated files already local and read-only.
  > This is for someone on a very slow 56k (ha!) modem that already has downloaded
  > all the source files in a zip file and now just wants to have perforce get synced.

p4 flush  acts like sync except it does not copy files to the client.

dave