If no group name is specified, the tag is created in the preferred group, and updated in any other location where a same-named tag already exists. TAG may contain one or more leading family 0, 1, 2 or 7 group names, prefixed by optional family numbers, and separated colons. ^= is used to write an empty string instead of deleting the tag when no VALUE is given, but otherwise it is equivalent to =, but note that the caret must be quoted on the Windows command line. += may also be used to increment numerical values (or decrement if VALUE is negative), and -= may be used to conditionally delete or replace a tag (see "WRITING EXAMPLES" for examples). += and -= are used to add or remove existing entries from a list, or to shift date/time values (see Image::ExifTool:: and note 6 below for more details). comment=wow), or delete the tag if no VALUE is given (eg.
Write a new value for the specified tag (eg. Exiftool - Read and write meta information in files SYNOPSIS ReadingĮxiftool FILE.
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