copy library to pd-extended library

first open terminal on the pi
move the terminal path to where the folder is (the folder pd is in the folder rjdj in the home/pi folder)

cd home/pi/rjdj


then to copy a folder

sudo cp -r  pd  /usr/lib/pd-extended/extra

this moves the folder pd (inside the folder rjdj - located at /hmon/pi)  to the pd library extra (inside the folder  /usr/lib/pd-extended/extra)

to remove a folder

sudo rm -r  /usr/lib/pd-extended/startup/pd