How to add and delete user sudo permissions in Ubuntu system

The Ubuntu system is also a system that many users prefer, so how do we create a new account on the Banwagonhost VPS and grant sudo permissions. This article records how to add or delete a user's sudo permissions on the Ubuntu 20.04 LTS operating system. sudo, short for substitute user do (or superuser do), is a program used in Unix-like operating systems such as BSD, Mac OS X, and GNU/Linux to allow users to run with special privileges in a secure manner Program (usually the system's superuser).

There are many ways to add or remove a user's sudo permissions in a Linux system. This article uses Ubuntu 20.04 as an example, but this should apply to almost all Linux distributions.

Preparation before starting

First of all, you need to connect to the Banwagonhost VPS through SSH. When connecting, we usually use the root account by default and already have sudo permissions. If you are using another account, make sure the account you use has sudo permissions.

Then, we can update the system first (optional):

sudo apt-get update && sudo apt-get upgrade

No matter which method is used below, you need to ensure that the user exists first.

We take the user bandwagonhostnet as an example and create the user first.

Use the command sudo useradd -m bandwagonhostnet to create a bandwagonhostnet user. Among them, -m is used to create the user directory, and there will be no prompt message after pressing Enter.

Enter the command sudo passwd bandwagonhostnet and press Enter to change the password. [sudo] password for bandwagonhostnet: New password: Retype new password: passwd: password updated successfully

Make sure we have changed the correct password.

After creating the users, use one of the following methods to grant them access to sudo or add them to the sudoers file.

Edit sudoers file directly to modify permissions

The first method, probably also the method that most friends know, is to directly edit the /etc/sudoers file. But usually we do not recommend using this method, because there are too many options in this file, and if we are not familiar with them, it is easy to make mistakes.

Generally speaking, editing the /etc/sudoers file is to grant sudo permissions to a user group, not to grant permissions to individual users. Therefore, it is recommended to give priority to the following two methods to add or remove sudo permissions for a single user.

Modify permissions through usermod command

In order to add sudo permissions to user bandwagonhostnet, we can use the usermod command:

Enter the command sudo usermod -aG sudo “bandwagonhostnet”

Enter your password as prompted

There will be no prompt message after completion, so we can enter groups bandwagonhostnet and the following information will be output: bandwagonhostnet : bandwagonhostnet sudo

The meaning of this output is that bandwagonhostnet is now a user of the group bandwagonhostnet and sudo, that is, it has sudo permissions.

Use the gpasswd command to modify permissions

In addition to the above commands, we can also use the gpasswd command to give users sudo permissions.

Enter the command sudo gpasswd -a mumbly sudo.

Enter your password as prompted, and then the following confirmation message will appear: [sudo] password for bandwagonhostnet: Adding user bandwagonhostnet to group sudo

If you want to verify whether it is successful, you can enter groups bandwagonhostnet, and the following information will be output: bandwagonhostnet : bandwagonhostnet sudo

This means that bandwagonhostnet is already a user of the group bandwagonhostnet and sudo, which means that sudo permissions have been successfully granted.

If you need to remove a user's sudo permissions, you can still use the gpasswd command. If bandwagonhostnet abuses access, you can deny permission:

Enter the command sudo gpasswd -d mumbly sudo.

Enter the password as prompted, and the following prompt message will appear: [sudo] password for bandwagonhostnet: Removing user bandwagonhostnet from group sudo

If you want to confirm whether sudo permissions have been deleted successfully, you can enter the groups mumbly command, and the following output information will appear: bandwagonhostnet : bandwagonhostnet

This means that the user bandwagonhostnet is currently only in the group bandwagonhostnet and no longer has sudo permissions.

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