Locate long file paths on external drive with terminal

Aperture will continue to look in the old location until you tell it differently. To do this:

1. Quit Aperture before changing the volume/folder names.
2. Make your changes in Finder.
3. Reopen Aperture and go to Aperture > Preferences.
4. Click General, if necessary.
5. Under the Library Location option, click Choose.
6. Locate your library and click Select.
7. Quit Aperture and restart it.

run 'find' from a root directory searching for plain files (-type f?) and -exec a bash script on each file (or perhaps automator).

Looks like you'll need a bit of 'basename' and 'sed'.

Append to an empty string for each input path, and treat that as a list for that file. I believe with 'tag' that you can pass a comma separated list, so you can append one (dealing with first having no comma) or post process using 'sed'. worst case loop over the list string and run 'tag' each time.

'tag' might be smart enough to append tags it doesn't already have what's passed, otherwise the top of the script might want to bail if the file already contains tags.

Not trivial to write, but if you're not familiar with bash, tag and sed it would be a good learning exercise.