Hi, I was reading a book “The Linux Command Line” E. Shotts,
there is an example in page 109 , “Exercising Our Privileges”,
it is telling to have 2 users, bill and karen, bill has superuser privileges via sudo.
Make a group “music”, add there karen and bill,
and bill is making a directory.
# All commands are run by bill $ sudo mkdir /usr/local/share/Music $ ls -ld /usr/local/share/Music drwxr-xr-x 2 root root ... $ sudo chown :music /usr/local/share/Music $ sudo chmod 775 /usr/local/share/Music $ ls -ld /usr/local/share/Music drwxrwxr-x 2 root music /usr/local/share/Music $ > /usr/local/share/Music/test_file
and here is the problem that permission is denied to create a file in Music directory.