# Get rid of any directory-time differences
$RSYNC -av --existing -f 'exclude,! */' from1/ from2/
$RSYNC -av --existing -f 'exclude,! */' from2/ from3/
# Get rid of any directory-time differences
$RSYNC -av --existing -f 'exclude,! */' from1/ from2/
$RSYNC -av --existing -f 'exclude,! */' from2/ from3/