rsync --delete-existing needed

[Erik Red]

Hi,

I made the mistake of doing an rsync of a directory into the wrong 
destination,
so that the destination became a mix of two directories of unrelated files.

Top unravel the mess, I could need something like a --delete-existing 
option.

The semantics would be to delete at the destination ONLY those files that 
exists at the
source.

I tried to concoct a combination of options that would do this, but without 
success. I thought someone here might know the answer. Or would this be a 
handy feature to add?

[One should of course use --dry-run and check the result before doing such 
an operation.]

Erik

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