Use "rsync --dry-run" to find directory difference, but ...

[Michael Wang]

I would like to use "rsync --dry-run" option to compare
two directories, make use the output programatically.

However, besides the filelist, rsync also spits out
some lines as shown below. And from version to version,
the message is different. For example, in a newer version,
we do not have "xxxx files to consider.", and no "^rsync: ".
This makes excluding these lines difficult.

Any advice? Thanks.

--
rsync: building file list...
rsync: 3154 files to consider.
...
filelist
...
wrote 65063 bytes  read 20 bytes  43388.67 bytes/sec
total size is 152420617  speedup is 2341.94
--

-- 
Michael Wang
http://www.unixlabplus.com/