There are some books with mobi and azw3 formats on my calibre library which I want to convert them to epub and I prefer to do it from command line.

I'm able to convert books using ebook-convert but I don't know how to add epub book to calibre.

calibredb add doesn't work since it considers the epub as duplicate which is true. But I want to see if there is a way to add the book as a new format to calibre library before messing with calibre sqlite db.

I have:

  • book id
  • epub path

I want:
- to add the epub to an existing entry

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