id3tool

Command line editor for id3 tags
A simple and complete editor for ID3 tags in MP3 files. ID3 tags are a way of
identifying mp3 music files - you can store Artist, Album, Title, Track,
Year, and Genre in a tag, as well as a 28-character comment.
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Highly recommended for scripting and bulk operations where you need
to edit id3 tags from scripts.
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Can also be used to read id3 tags.
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Homepage: http://nekohako.xware.cx/id3tool/