Level 1 - Server Level 1 - Workstation
The usermod command can be used to specify which group the root user belongs to. This affects permissions of files that are created by the root user.
Using GID 0 for the root account helps prevent root-owned files from accidentally becoming accessible to non-privileged users.
Run the following command and verify the result is 0:
# grep "^root:" /etc/passwd | cut -f4 -d: 0
Run the following command to set the root user default group to GID 0:
# usermod -g 0 root