Hi , just to add : the file name is only place from where i can get info about title and author. Sometimes an opening of the book itself does not help. The cover is missing and only the text is there without title page and author.
That's why rename all my books (for that I spend a few days using bulk rename utility , first I had some books already in my calibre library and have to swap title and author) in the structure "< author> - <book name>.pdf " ). The Author exactly one space before - and the title one space after - , to make easier to extract title and author from the file name , with some script or tool. ( I am not good in programing)
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