i had the exam just now and had some strange problems with the permission writing the result files. all the files i had to create eg.
/opt/foo/answer001 did already exist and i could not write in to the files… the file always had permission denied. i tried to write with sudo but no success…
the only thing i could do was
k get node foo > tmp.txt ,
sudo rm /opt/foo/answer001 and
sudo cp tmp.txt /opt/foo/answer001