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Scaricare exiftool http://www.sno.phy.queensu.ca/~phil/exiftool/

#!/bin/bash
ls -1 *.JPG *.jpg | while read fn
do
export dt=`exiftool "$fn" | grep -m 1 "Create Date" | awk '{ printf "%s_%s.jpg", $4, $5 }' | tr -d ":"`
if test ! -e ./$dt
then
 mv "$fn" $dt
 echo Foto "$fn" rinominata in "$dt"
fi
done
echo Fatto!