Finding Unused Assets in a site?

Been awhile since I've visited here. Anyway, have a question about site
management. I thought there used to be a command to list out any assets
in a defined site that are currently not being used, though am having a
hard time finding it. Is there such a command?

Thanks in advance!
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Ian Kelleigh
Ian_nospam_ (AT) FreeHandSource (DOT) com

"The FreeHand Source"
http://www.FreeHandSource.com