Say I have two tags, "Green", and "Green 1".
How do I replace all instances of the "Green 1" tag with the "Green" tag, across all files on my device?
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I've had two 'Green' tags, though with slightly different names for quite some time, so I thought I'd see if I could find a workaround.
Best I can come up with is in effect a find, add, remove. Fortunately it turns out I'd only a few 'other Green' so it was quite quick, but you can almost see the Finder 'thinking' as it ticks through them all.
From Finder Prefs>Tags, make sure both are ticked & then drop both your 'Greens' into the favourites at the bottom, circled. You can only have 5 at once, so others will be removed. You can re-add afterwards. Leave this window open, you'll be coming back to it.
Open a Finder window & select your 'to be deleted' tag in the sidebar, to list all the files tagged with it. Mine was called 'In Queue'
Cmd ⌘ A to Select All.
Right click & assign the other green tag to the files, so they now have both tags.
Give the Finder time to finish - you can see it adding the second green dot…
Then - right click again & remove your unwanted tag.
Everything is now tagged with the single, wanted, Green tag.
Go back to Finder prefs & you can delete the extra tag altogether.