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Here's what I use to tag jpg images with exiv2 and dmenu, using Exif.Photo.UserComment and Iptc.Application2.Keywords:
Install dmenu and exiv2
The shell-script image-metadata.sh does the actual work, we tell feh to use it for two actions and the info:
I put the following into my .bashrc
alias feh="feh --action1 \;\"image-metadata.sh edit-comment %f\" --action2 \;\"image-metadata.sh edit-tags %f\" --info \"image-metadata.sh show %f\" "