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This article will explain in detail the example analysis of the user management / etc/group group file of the Linux system. The editor thinks it is very practical, so I share it with you for reference. I hope you can get something after reading this article.

A collection of users with some common characteristics is a user group (Group). The user group (Group) configuration files are mainly / etc/group and / etc/gshadow, where / etc/gshadow is the encrypted information file of / etc/group.

Grouping users is a means to manage users and control access rights in Linux system. Each user belongs to a user group; there can be multiple users in a group, or a user can belong to a different group. When a user is a member of multiple groups at the same time, the primary group to which the user belongs is recorded in the / etc/passwd file, that is, the default group to which the user is logged in, while the other groups are called additional groups.

All the information about the user group is stored in the / etc/group file. The format of this file is separated by a colon (:) with several fields as follows:

Group name: password: group identification number: list of users in the group

Specific explanation:

Group name:

The group name is the name of the user group and consists of letters or numbers. Like the login in / etc/passwd, the group name should not be duplicated.

Password:

The password field stores the encrypted password of the user group. In general, the user group of a Linux system does not have a password, that is, this field is usually blank or *.

Group identification number:

The group identification number, which is similar to the user identification number, is also an integer and is used to identify the group within the system. Otherwise known as GID.

List of users in the group:

Is a list of all users who belong to this group, separated by commas (,). This user group may be the user's primary group or an additional group.

Examples of use:

Output:

[root@localhost test6] # cat / etc/group

Root:x:0:root,linuxsir

Bin:x:1:root,bin,daemon

Daemon:x:2:root,bin,daemon

Sys:x:3:root,bin

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