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Assumed dir A, B, C are subdirs of the current dir
Exact syntax of the command is:
rsync -v -r --size-only --compare-dest=/path_to_A/A/ /path_to_B/B/ /path_to_C/C/
(do not omit end-slashes, since that would copy only the names and not the contents of subdirs of dir B to dir C)
You can replace --size-only with --checksum for more thorough file differences validation
Useful switch:
-n, --dry-run perform a trial run with no changes made
There are 7 alternatives - vote for the best!
If you can do better, submit your command here.
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