> cat t.args -IPTC:Caption-Abstract<$caption-abstract Text $CreatedDate $City, $Country $/ new line > exiftool a.jpg -iptc:all > exiftool a.jpg -@ t.args Warning: [minor] Tag 'caption-abstract' not defined - a.jpg 0 image files updated 1 image files unchanged > exiftool a.jpg -@ t.args -f 1 image files updated > exiftool a.jpg -iptc:all Caption-Abstract : - Text - -, - . new line Application Record Version : 4 > exiftool a.jpg -caption-abstract -b - Text - -, - new line