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Fun with exiftool!
So I'm moving some files from one Flickr account to another, and since there is no existing tool to do this directly, I have to download them and re-upload them. Unfortunately all the work I did adding titles and descriptions will be lost if I simply download the albums using Flickr's download button, because they don't write that data to the exif or iptc metadata in the image file.
So - I use Flickr Downloadr to handle the downloads, but it copies the title and description into a separate json file. I got to spend several hours beating my head against a brick wall until I finally found the correct syntax and a bash for-loop to extract this metadata from the json files and insert it into the image files. Now when I upload them, Flickr sees the metadata in the correct fields and auto-populates the Title and Description and all is well in the world.
Code has been added to my Code Snippets page, if you ever find yourself in a similar place.