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

[John Reye]

By the way, the application of this is for the following:

If you have 2 huge source trees with only a few differences:
old/
new/

then I want to create 2 new minimal source trees, that contain only the
differences:
old_archive/
new_archive/

This way, I can send someone
old_archive/ and new_archive/
that contain only the few differences, instead of sending the huge
source-trees
old/ and new/

:)

Regards, John


On Wed, Jan 30, 2013 at 12:15 AM, Kevin Korb <kmk at sanitarium.net> wrote:

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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
>         Systems Administrator           Internet:
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