Re: question: does "diff" use short cuts?

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On Sat, 2023-07-08 at 08:34 -0500, Robert Nichols wrote:
> On 7/8/23 03:31, Patrick O'Callaghan wrote:
> > On Fri, 2023-07-07 at 19:11 -0600, home user wrote:
> > > What I back up is a mix of binary and text files.  I understand
> > > that
> > > "diff" is not the best for binary files, but "cmp" does not have
> > > a
> > > recursive option.  "rsync" does copying.  I don't see how that
> > > command (including with the "--dry-run" option) will verify the
> > > back-
> > > up.
> > 
> > 'rsync --dry-run' will tell you if it thinks some files need to be
> > copied because they have changed. If you do this after your backup
> > procedure, then you'll be checking that it worked correctly.
> 
> Note that by default rsync does not check the content of files when
> deciding what needs to be updated. It just checks the file
> modification times and sizes. You have to use the "-c" (--checksum)
> option to make it check the content.

Good point.

poc
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