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(Read here for some ramblings on the subject of writing meta information.) Tag values are written rather than being extracted if any tag name ends with a ' option, but for a single tag.
See the -n option in the application documentation for more details.
The priority of the groups is given by the list above.
i) From the command line: The Perl application ("").Alternatively, information may be written to a specific group only, bypassing these priorities, by providing a group name for the tag.The "Writing Meta Information" section above gave the syntax rules for exiftool command-line arguments to do this.No other libraries or software required, but some optional Perl modules may be added to enable certain Exif Tool features (for details, see the DEPENDENCIES section of the README file included in the full distribution).Windows users: A stand-alone Windows executable version of Exif Tool is available which doesn't require Perl.