Is there any way to embed metadata directly to ebooks?

[liam-maps]

I want to thank you and congratulate you for this amazing piece of code.
Your scripting skills are amazing.
I'm using the organize-books.sh and interactive-organizer.sh scripts to make sure the books are correctly renamed, but I'd like to embed the metadata directly to the files.
At this moment, I end with the metadata in human readable format (incompatible with calibre) and a set of books more or less well renamed and supervised by me (with the interactive script) that I'm forced to feed to calibre in order to scrape again (and prone to failure) to be able to embed the metadata later.
Is there any way the first script generates opf metadata format in order to embed it directly to calibre or better, that the script embeds the metatada itself?

Thank you again.