--compare-dest -- copy ONLY files with content-differences between 2 directories... to a third

Kevin Korb kmk at sanitarium.net
Tue Jan 29 16:15:20 MST 2013


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That sounds more like a job for --backup and --backup-dir instead of
- --checksum and --compare-dest but I have not tried to do this before.

On 01/29/13 18:13, John Reye wrote:
> Hello,
> 
> thanks for the reply, but I must confess: I don't understand it.
> 
> How would I go about using rsync to copy only files with content 
> difference between folder new and old (or existance-only in folder 
> new)... from folder new to a third folder new_archive... ??? along
> the lines of:
> 
> 
> rsync -av  --checksum --delete --progress --stats
> --compare-dest=../old new/ new_archive
> 
> (I've been trying around with --ignore-times and --size-only... but
> that didn't lead anywhere...)
> 
> Can this actually be done with rsync?
> 
> Thanks, John
> 
> 
> On Wed, Jan 30, 2013 at 12:01 AM, Kevin Korb <kmk at sanitarium.net 
> <mailto:kmk at sanitarium.net>> wrote:
> 
> With -a you are telling rsync to copy the timestamp difference.
> It can't set a timestamp on nothing.
> 
> On 01/29/13 17:58, John Reye wrote:
>> Hi,
> 
>> I'm having trouble with --compare-dest, to copy only files that 
>> differ in content.
> 
>> Here are the commands used thusfar: rsync -av  --checksum
>> --delete --progress --stats --compare-dest=../old new/
>> new_archive
> 
>> rsync -av --checksum --delete  --progress --stats
> --compare-dest=../new old/
>> old_archive
> 
>> old/ a.txt
> 
>> new/ a.txt
> 
> 
>> Note: both a.txt are the same (except for a different
>> timestamp). a.txt contains just 2 characters: 'a' and '\n'
> 
>> Now the problem: In the output I see a.txt get copied!!! 
>> old_archive/ a.txt
> 
>> new_archive/ a.txt
> 
>> I do NOT want this! Why is a.txt getting copied, when it is 
>> identical in its content?
> 
>> Please can you help, so that only files that DIFFER IN CONTENT 
>> ONLY... get copied.
> 
>> Thanks. John
> 
> 
> 
> 
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> 
> 

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	Kevin Korb			Phone:    (407) 252-6853
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