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i use rsync -avh

I just want to know that if the file on destination already exists does the rsync overwrite the new file or not

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up vote 5 down vote accepted

If the file contents are the same, then no; it will merely fudge the metadata to match. If the file contents differ then the file will be overwritten; use --ignore-existing to change this behavior, or -u to use a different, sane behavior.

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So it actually replaces the file, not update? If that file is hard-linked, the the other link is unaffected? – Mark Jul 31 '15 at 15:56

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