Overwriting old/corrupted files in a backup

Linux for blind general discussion blinux-list at redhat.com
Wed Aug 16 12:57:01 UTC 2017

Use rsync instead. You'll never look back.


Linux for blind general discussion writes:
> Okay, so using the cp command with the -Rn switch is convenient for
> say copying my Music folder from my home directory to an external hard
> drive or the SD card for my portable Media player when the destination
> already has an older copy without needing to copy everything already
> present in the old copy, manually determining what's been added and
> copying manually, or dealing with a bunch of prompts. It also allows
> an aborted copy to more or less be resumed from where it left off.
> This method is simple enough to not require scripting or complex
> command syntax, but it does have a few downsides:
> 1. It won't overwrite corrupted files left by an interrupted copy, and
> such files are too rare for manual searching.
> 2. Files that have been altered don't get copied. unless they've
> changed filename. Not a big issue for copying my Music folder since
> those files are seldom altered, but copying say, my writing folder can
> lead to the backup media containing only older drafts of some
> documents.
> 3. It tells me nothing of files from an older copy that have been
> deletd/renamed since the last copy. jdupes can find old files on the
> destination media if the new file is just a rename, but it can't help
> with files that have been altered as well as renamed.
> I suppose what I'm looking for is a command line utility or script
> that executes the following pseudo code:
> Given directories source and destination:
> for every file found in both source and destination:
> if file.source != file.destination
> prompt user whether to overwrite one version of the file with the
> other or to add the files to a list for later examination.
> For every file only in source:
> search for match in destination.
> If match found prompt user towhich to rename to match.
> If not match found, copy to destination.
> For every file only in destination:
> search for match in source.
> If match is found, prompt user to which file should be renamed.
> If no match is found, prompt user whether to copy of delete.
> If anyone knows of command line utilities to help with this task, it
> would be greatly appreciated.
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Janina Sajka,	Phone:	+1.443.300.2200
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		Email:	janina at rednote.net

Linux Foundation Fellow
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