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How would I go about rsyncing the difference between two directories to a 3rd directory. For example, if I have the command

rsync -av --progress --stats /hdd1/ /hdd2/

I would like to copy the difference between hdd1 and hdd2 to a 3rd directory, without copying any data to hdd2 (as it is a full hard drive). What's the best way to go about this?

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Maybe the --compare-dest option of rsync could be helpful. I think

rsync -av --progress --stats --compare-dest=/hdd2 /hdd1/ /3rd_dir/

might work.

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  • I just noticed the compare-dest argument is relative to the '3rd_dir'. In this case you are using absolute path, but if hdd2 where a dir relative to 3rd_dir, you would need to use the relative path from 3rd_dir.
    – code-gijoe
    Aug 13, 2012 at 14:24

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