What is the use of linux user groups?

In Linux, a user group is a mechanism that brings together a group of users. It has the following functions: 1. Used to manage permissions on files and directories; 2. Used to share and manage system resources; 3. By classifying a group of users into the same user group, the management of users and permissions can be simplified.

The operating system of this tutorial: Linux5.18.14 system, Dell G3 computer.

In Linux, a user group is a mechanism that brings together a group of users. User groups have the following functions:

• Management permissions: User groups can be used to manage permissions on files and directories. By adding users to the corresponding user groups, you can share and manage files and directories. User groups can give certain users common read, write, and execute permissions.

• Manage resources: User groups can be used to share and manage system resources. For example, multiple users can be assigned to the same user group, and all users can access shared folders or network shares to which the group belongs.

• Simplify management: By grouping a group of users into the same user group, you can simplify the management of users and permissions. When you need to operate on a group of users, you only need to manage them through user groups instead of dealing with each user one by one.

The basic steps for using user groups are as follows:

1. Create a user group: You can use the groupadd command to create a user group, for example sudo groupadd mygroup will create A user group named "mygroup".

2. Add users to user groups: Use the usermod command to add existing users to the user group, for example sudo usermod -aG mygroup username to add user "username" to user group "mygroup" middle.

3. Assign file permissions: Use the chown and chmod commands to set the owners and permissions of files and directories. You can assign user groups as owners of files or directories and set appropriate permissions to enable group sharing and management.

4. Manage user groups: You can use the groupmod and groupdel commands to modify and delete user groups. For example, sudo groupmod -n newgroup oldgroup will change the name of the user group "oldgroup" to "newgroup".

By using user groups, you can simplify the management of users and permissions, and realize resource sharing and permission control. Note that when operating user groups, be careful to ensure that security and permission settings are correct.

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