What does linux groups mean?

linux groups is a command in Linux. The groups command is used to query the groups a user belongs to. The command format is "groups [OPTION]... [USERNAME]...", where the option "help " means displaying help information and exiting. The option "version" means displaying version information and exiting.

#The operating environment of this tutorial: linux5.9.8 system, Dell G3 computer.

What do linux groups mean?

groups command.

1. Command introduction

The groups command is used to query the groups to which the user belongs.

2. Command format

groups [OPTION]... [USERNAME]...

Displays all groups to which each entered user name belongs. If no user name is specified, it defaults to the current process user (this may occur when the user group database changes difference).

3.Option description

--help
显示帮助信息并退出
--version
显示版本信息并退出

4.Common examples

(1) Display the groups to which the current user belongs.

groups
root

The current user is root, and there is only one main user group root.

(2) View the groups to which user root belongs.

groups root
root : root

5. Expand knowledge

In addition to using the grpups command to check which groups a user belongs to, you can also use the following methods.

(1) View /etc/group.

/etc/group is the user group configuration file. You can view this file and use the grep command to query the user group to which a user belongs. For example, if you check the user group

grep root /etc/group
root:x:0:

where root is located, you can see that root only belongs to the main group root with the same name and does not belong to any other group.

(2) Through the id command.

id root
uid=0(root) gid=0(root) groups=0(root)

The third column represents the list of user groups to which the user belongs, and outputs the group ID.

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