On Nov 14, 2011, at 10:59 AM, Jean-Armel Luce wrote:

> just for the value : rsync --checksum is the option to use to prevent
> copying of identical files

No, that's not what it's used for. It already avoids sending identical blocks 
by using checksums. --checksum forces a checksum on files that have identical 
sizes & mod times, thus catching files that have different contents despite 
having the same mod times & sizes.

-- 
Scott Ribe
scott_r...@elevated-dev.com
http://www.elevated-dev.com/
(303) 722-0567 voice





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