Fix time-stamped filenames of JPEG images according to the EXIF date the photo was taken

(IFS=': '; for i in *.(#i)jpg; do set $(exiv2 -K 'Exif.Image.DateTime' -Pv $i 2> /dev/null); mv -v $i "$1-$2-$3${i#[0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9]}"; done)
For each *.jpg or *.JPG file in the current directory, extract the date the photo was taken from its EXIF metadata. Then replace the date stamp, which is assumed to exist in the filename, by the date the photo was taken. A trick from https://unix.stackexchange.com/a/9256 is used to split the date into its components.
Sample Output
'2020-04-12 DSC_0146.JPG' -> '2017-12-26 DSC_0146.JPG'
'2020-04-12 DSC_0147.JPG' -> '2017-12-28 DSC_0147.JPG'

0
By: langec
2020-05-16 12:10:00

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