Debian 2: Users, Groups, Permissions

1. Creating a new user
2. Creating a new group
3. Viewing existing users
4. Viewing existing groups
5. Adding an existing user to an existing group
6. Adding an existing user to multiple existing groups
7. Removing a user from a group
8. Removing a user
9. Removing a group

View Existing Groups

1. $ less /etc/group
2. $ getent group

Adding an existing User to an existing Group

1. $ sudo usermod -a -G groupname username

Add an Existing User to Multiple Groups in One Command

1. $ sudo usermod -a -G group1,group2 username

Resources:

1. https://linuxize.com/post/how-to-list-groups-in-linux/