This is a tiny that to access user's comments in books from iBooks.
For now it just generates a mrkdown file with all comments for all books.
iBooks stores books and comments data in ~/Library/Containers/com.apple.iBooksX/Data/Documents.
That is valid in time of writing, that actually might change later.
Both paths must be provided to script via ENV variables:
DATA_DIR=iBooksX/Data/Documents ./ibooks