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Table of Contents
Use the usermod command to add users to the sudo group
Using wheel groups in CentOS/RHEL systems
Check if the user has joined the sudo group
Verify that sudo permissions are in effect
Home System Tutorial LINUX How to add an existing user to the sudo group?

How to add an existing user to the sudo group?

Jun 22, 2025 am 12:25 AM
sudo user

The most common way to grant administrator privileges to ordinary users in Linux systems is to add them to the sudo group or wheel group. The specific steps are as follows: 1. Use the sudo usermod -aG sudo username command to add the user to the sudo group (for Debian/Ubuntu systems); 2. For CentOS/RHEL systems, use sudo usermod -aG wheel username and enable the %wheel ALL=(ALL) ALL configuration; 3. Use the groups username command to confirm whether the user has successfully joined the corresponding group; 4. Switch to the user and execute sudo ls /root to verify whether the permission is effective; if you encounter problems, you can check whether the group name is correct, whether the configuration file is enabled, and view the system log to obtain error clues.

How to add an existing user to the sudo group?

In Linux systems, if you already have a normal user account and want to give it administrator rights, the most common method is to add this user to sudo group. In this way, the user can use the sudo command to perform operations that require root permissions.

The following are several common methods, you can choose the appropriate method according to your system environment.


Use the usermod command to add users to the sudo group

This is the most direct way. In most Debian or Ubuntu-based systems, sudo group already exists, just add the user:

 sudo usermod -aG sudo username
  • -aG means "append to group" and will not affect the user's existing permissions of other groups.
  • username is the user name you want to add.

Note: After the modification, the user needs to log in again to take effect, because the group information is loaded when logging in.


Using wheel groups in CentOS/RHEL systems

Some distributions (such as CentOS, RHEL) use wheel groups instead of sudo groups by default. You need to add the user to this group:

 sudo usermod -aG wheel username

Also make sure wheel group permissions are enabled in the /etc/sudoers file. You can check if this line exists and uncomment it:

 %wheel ALL=(ALL) ALL

If you are not sure which group to use, you can use groups username to view the administrator group naming method of the current system.


Check if the user has joined the sudo group

You can confirm whether a user has been correctly added to sudo or wheel group by following the following command:

 groups username

The output should contain the corresponding group name. For example:

 username : usergroup sudo

If you do not see the relevant group name, it means that the addition has failed or has not taken effect.


Verify that sudo permissions are in effect

Switch to the target user and try to execute a command that requires sudo , such as:

 sudo ls /root

If the system prompts for a password and the content can be listed successfully, it means that the permission has taken effect.

If you encounter an error in permission denied or the user is not in the sudoers file, it may be because:

  • The user is not added to the group correctly;
  • The group name used is inconsistent with the system default;
  • /etc/sudoers file is configured incorrectly.

You can check /var/log/auth.log (Ubuntu/Debian) or /var/log/secure (CentOS/RHEL) for more clues.


Basically these steps. Although it seems simple, pay attention to the slight differences in the details of different systems, especially the group name and configuration file location. Just don't mess it up.

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