Rename JPEGs by Exif Timestamps
exiv2(1) is a tool for image metadata manipulation that also lets you rename files based on its metadata. From the manpage:
mv | rename
Rename files and/or set file timestamps according to the Exif create timestamp. Uses the value of tag Exif.Photo.DateTimeOriginal or, if not present, Exif.Image.DateTime to determine the timestamp. The filename format can be set with -r fmt, timestamp options are -t and -T.
To rename all JPEG files in a folder, use
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