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Question to rsync

Hi folks,

I am looking for an option in rsync, which I can not find any more. I read the 
manual, but in the manual I could nor find the optiuon I am looking for. 

In earlier versions, there was rsync -av -d, where "-d" was the tag, which 
did, what I wanted: I want to delete any files in the target,. when they are 
not existing in the source.

I am sure, this option stilll exists in the  actual rsync version, but I  can 
not find it (although, there is a "--delete", but looks to do something else)

Does anyone know, where the required function is hidden?

Thanks for any hints.

Best regards