export pdf from iBooks in iCloud

$ cd ~/Library/Mobile Documents/iCloud~com~apple~iBooks/Documents/

$ pwd                                                                                                       ✔ │ base 
/Users/onesixx/Library/Mobile Documents/iCloud~com~apple~iBooks/Documents

$ ls -al *.pdf                                                                                              ✔ │ base 
-rw-r--r--@ 1 onesixx  staff   492493 Mar 27  2019 Data Transformation with datatable CHEAT SHEET.pdf
-rw-r--r--@ 1 onesixx  staff   772627 Mar  8  2021 Deep Learning vs Traditional Computer Vision.pdf
-rw-r--r--@ 1 onesixx  staff   382417 Mar 27  2021 Deep Learning with Keras_CHEAT SHEET.pdf
-rw-r--r--@ 1 onesixx  staff   756338 Mar 27  2021 Deep Learning with R  - PPT.pdf

$ mv "a.pdf" /Users/onesixx/mydoc/PDF-ibooks/

$ mv *.pdf /Users/onesixx/mydoc/PDF-ibooks/
$ mv *.epub /Users/onesixx/mydoc/PDF-ibooks