Depends very much on the problem domain. It's really easy to do this on macOS.
So for example I have a top level `Documents/docs` directory. In this everything is recorded in format `yyyy-mm-dd Title.ext` format. I have a saved search which says "give me everything untagged". I will select each thing that is untagged and then tag it!
So for example I have a top level `Documents/docs` directory. In this everything is recorded in format `yyyy-mm-dd Title.ext` format. I have a saved search which says "give me everything untagged". I will select each thing that is untagged and then tag it!