exiv2 insert -l/tmp -S.CRW /data/*.JPG
exiv2 -r':basename:_%Y%m' rename img_1234.jpg
exiv2 -M"set Exif.Photo.UserComment charset=Ascii New Exif comment" image.jpg
exiv2 -M"add Iptc.Application2.Credit String Mr. Smith" image.jpg
exiv2 -et img1.jpg img2.jpg
exiv2 -m cmd.txt image.jpg
exiv2 rename img_1234.jpg
exiv2 -M"set Exif.GPSInfo.GPSLatitude 4/1 15/1 33/1" \
exiv2 -it img1.jpg img2.jpg