Convert single Apple epub to standard epub

apple_epub_to_std_epub.sh

#!/bin/bash
# Based on: https://www.reddit.com/r/Calibre/comments/dza1zi/comment/lxz97q5/
# Except this just does a single Apple epub, which is a directory (folder);
# loop over it to do a directory.
# WARNING: DOES NOT HANDLE BOOKS WITH DRM
# Downloaded Apple Books books are in:
#     ~/Library/Containers/com.apple.BKAgentService/Data/Documents/iBooks/Books
# Books in iCloud are in:
#     ~/Library/Mobile Documents/iCloud~com~apple~iBooks/Documents

cwd=$( pwd )
title=""
if [[ -d "$1" ]]
then
    cd "$1"
    export title="$( grep -A1 itemName iTunesMetadata.plist | grep \<string\> | cut -f2 -d'>' | cut -f1 -d'<' )"
    echo "Found: ${title}"
    find . -name "iTunesMetadata*.plist" -delete 2> /dev/null
    zip -0X "~/Downloads/tmp.epub" mimetype > /dev/null
    zip -rDX9 "~/Downloads/tmp.epub" * -x "*.DS_Store" -x mimetype > /dev/null
    echo "Converting: $1 -> \"${title}.epub\""
    cd $cwd
    mv ~/Downloads/tmp.epub "${title}.epub"
else
    echo "ERROR: ${1} is not an Apple Books epub. Ignoring."
    exit 1
fi

convert_all_apple_books.sh

#!/bin/bash

# To convert all Apple books; copies all converted books to the Downloads folder

# Only downloaded books
# /bin/cp -R ~/Library/Containers/com.apple.BKAgentService/Data/Documents/iBooks/Books/*.epub $TMPDIR

# All iCloud books
/bin/cp -R ~/Library/Mobile\ Documents/iCloud~com~apple~iBooks/Documents/*.epub $TMPDIR

cd $TMPDIR

for book in *.epub
do
    apple_epub_to_std_epub.sh "${book}"
    /bin/rm -rf "${book}"
done

cp *.epub ~/Downloads