Introduction
The different groups maybe have different permissions in a Linux server, how to add user to a specific group is an important operator.
What I want to record today is about group operations in Linux system, for example: how to change user groups.
View your groups
If you want to view the user’s own group, you can use the following command:
groups
View all groups information
If you want to be able to view all the groups and who in this group, then you can use the following command:
cat /etc/group
Create group
If you want to create a specific (name) group, you can use the following command:
sudo groupadd "group_name"
“group_name” is the name of the group you wish to create.
Change a user to a specific group
The following command is to change a specific user to a specific group:
sudo usermod --gid "group_name" "user_name"
If you want users to join a specific, plural groups, you can use the following command to join:
sudo usermod --append --groups "group_name_01", "group_name_02" "user_name"
After “–groups“, you can connect multiple group names, which allows users to join multiple groups at once, which is quite convenient.
My thoughts
How to configure groups settings is a seemingly inconspicuous but very important function in Linux, especially when Linux is used as a multi-person server.
Different groups can have different permissions and master control over different work areas, so that they will not conflict with each other and can work together. Therefore, I think it is necessary for administrators to clearly distinguish between users with different needs, or users who perform different tasks.
I hope that in the future more about groups in Linux, I can update them in this article together.
References
- https://www.howtogeek.com/50787/
- https://unix.stackexchange.com/questions/151113/how-to-change-primary-group