As described in this answer, you can manually polish EPUB files so they are updated with the metadata you added or changed in calibre, without converting the EPUB files.
At least on Linux there is a problem with this functionality if you have many files:
- You cannot select all EPUB files (after searching for
format:epub) and start the conversion of them all if there are more than 25-50 files.
- You cannot find which files need polishing and which not, so if you lost track after updating several books, you need to start from scratch.
- You cannot easily run
ebook-polishfrom the commandline on all EPUB files, using
find. As files with name
...polished.epubmight exists and because the output files cannot be specified and need to be renamed.
Is there a more easy way to polish all and only the EPUB files that need updating?