rsync "-I" vs. "-c"
c.shoemaker at cox.net
Sun Aug 1 21:33:33 GMT 2004
On Sun, Aug 01, 2004 at 06:20:11PM -0700, Linda A. W. wrote:
> If I use the "-I" to ignore date and size as quick-check methods of
just modtime. rsync never ignores size differences.
> change, what method does it use to determine difference? If it falls
> back to
> checksumming the entire file, maybe the manpage might warn that this
> would be
> as expensive as using the "-c" option...or not depending on what it uses for
> determining difference at that point.
Short answer: It does fall back to checksum comparison.
Long answer: I'm not sure, but I suspect that the reason this is not so
explicit in the man page is that it's a bit complicated in the code,
too. I _think_ that using -I would be even more expensive than -c,
because it will take longer to eventually do the same checksum
But, Wayne knows these options like the back of his hand. Wayne?
> So exactly how does rsync compare files for differences when date & size are
> used but checksumming is not?
> To unsubscribe or change options:
> Before posting, read: http://www.catb.org/~esr/faqs/smart-questions.html
More information about the rsync