I'm going to go with you being crazy. Although based on your mention of "deja vu" and the number "4", I did see djview4. I don't think that's what you wanted though.
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Me too i went back to the linux install i wouldve used it on, and I couldn't find exiv4 just exiv2 so I misremembered.
Gonna need a bit more than that to go on. Was its functionality similar to exiv2? How long ago do you remember it from? Can you at least link the old SO post you found?
yes it was literally the same as exiv2. I remember it from maybe 6 months to a year ago. I went to the install which I remembered using it on, and it was exiv2, so I am wrong.
exiftool?
No just a bad memory. it was exiv2 all along, I checked.