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exiftool Usage
> extract info
# exiftool [file]
$ exiftool image.png

> set artist tag
# exiftool -artist=[name] [file]
$ exiftool -artist=b0ydC image.png

note: for more files, just add the files one each separated by spaces.

> set tag to a folder content
# exiftool -artist=[name] c:/[folderContent]
$ exiftool -artist=b0ydC C:/offsecvault_archives

some flags:
-H = extract hex value