Add to sudo list linux

How do I add a user to the «sudo» group?

The a is very important. Without it they’ll be removed from all other groups. You will need to either restart your shell/terminal or log out and back in for this to take effect.

@Teifi, that means you probably don’t have sudo installed or, for some weird reason, it’s not in your path. What happens when you run which sudo ?

New terminals were not enough. Ended up rebooting for another reason and now it works. Probably log-out/in.

I know a is for append, but i think it will be more usefull to have append as default behavior. Creating an alias is easy so that will be the way to have groupadd group then just append it. I did the command without -a once today as i didn’t remember the -a argument.

Although this is an Ubuntu forum, For CentOS I had to do sudo usermod -aG sudo . Because there was no easy way for me to find this out.

You can either use the user management GUI for it (same place where you create users), or use sudo adduser sudo in the command line.

This is also referred to in the ubuntu documentation on RootSudo albeit they refer to the admin group instead of the sudo group

You can also use a graphical interface. Click on the gear on the top right of the panel, then select «System Settings» and then «User Accounts»

You need to click the little unlock button to be able to edit things in this window. Then click on the person’s account and select the proper dropdown for «Account Type»

I have Ubuntu 10.10 but my graphic interface is someway locked. It opens but I when buttons are pressed nothing happens. I suppose is something related to the privileges (I’m actually sudoer). How can I solve this issue?

Nice animation! I’d like to do such a gif animation to show new features of my web app ? I’m on Lubuntu 16.04.

Its really simple if you are using Unity as your desktop environment.

If you have created a user already then you can simply change it from Standard to Administrator, else make sure that you selected Administrator when creating a new one.

_{Don’t forget to unlock before trying to change it}

I am late to the party, but this answer might help someone that uses Ubuntu inside a Docker container.

I recently created a Docker container based on Ubuntu 16.04.1.

By default, the Docker Ubuntu image is a stripped down version of Ubuntu, which does not have a vast majority of common tools including sudo .

Besides, by default, the user is logged in to the Docker container as root.

Therefore, I started the container with the docker run command, and installed the ‘sudo’ package:

root@default:/# apt-get install sudo 

Running the command adduser myuser sudo reported error adduser: The user ‘myuser’ does not exist. . After reading this answer, I first ran the command to create the user:

root@default:/# adduser myuser 

Then ran the following command:

root@default:/# adduser myuser sudo Adding user `myuser' to group `sudo' . Adding user myuser to group sudo Done. 

The user myuser was successfully added to the sudo group.

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How To Add User To Sudoers & Add User To Sudo Group on Ubuntu

The sudo command is the preferred means to handle elevated permissions. In supported versions of Ubuntu, using the sudo command will grant elevated permissions for 15 minutes.

Standard user accounts are restricted from performing sensitive tasks, such as viewing the contents of the /root directory. This prevents the accidental use of commands with massive consequences. It also makes it more difficult for intruders to compromise a system. However, sometimes you need to run an administrative command. Sudo – or Super User Do – grants you privileges to run sensitive tasks.

This simple tutorial will show you how to add a new user on Ubuntu and provide sudo access.

• A system running a supported version of Ubuntu
• Access to a root user account or another account with sudo privileges
• Access to a terminal window/command line (Ctrl–Alt–T)

Note: Linux Sudo Command tutorials also available for CentOS and Debian.

Steps to Add Sudo User on Ubuntu

Step 1: Create New User

1. Log into the system with a root user or an account with sudo privileges.

2. Open a terminal window and add a new user with the command:

The adduser command creates a new user, plus a group and home directory for that user.

You may get an error message that you have insufficient privileges. (This typically only happens for non-root users.) Get around it by entering:

3. You can replace newuser with any username you wish. The system will add the new user; then prompt you to enter a password. Enter a great secure password, then retype it to confirm.

4. The system will prompt you to enter additional information about the user. This includes a name, phone numbers, etc. – these fields are optional, and can be skipped by pressing Enter.

Step 2: Add User to Sudo Group

Most Linux systems, including Ubuntu, have a user group for sudo users. To grant the new user elevated privileges, add them to the sudo group.

In a terminal, enter the command:

Replace newuser with the username that you entered in Step 1.

Again, if you get an error, run the command with sudo as follows:

sudo usermod -aG sudo newuser

The -aG option tells the system to append the user to the specified group. (The -a option is only used with G .)

Note: Usermod command is a useful tool for user management. To learn more about its options, refer to our guide How To Use The Usermod Command In Linux.

Step 3: Verify User Belongs to Sudo Group

Enter the following to view the groups a user belongs to:

The system will respond by listing the username and all groups it belongs to, for example: newuser : newuser sudo

Step 4: Verify Sudo Access

Replace newuser with the username you entered in Step 1. Enter your password when prompted. You can run commands as normal, just by typing them.

However, some commands or locations require elevated privileges. If you try to list the contents of the /root directory, you’ll get an access denied error: ls /root

The command can be executed with:

The system will prompt for your password. Use the same password you set in Step 1. You should now see the contents of the /root directory.

Now you know how to add and create a user with sudo privileges on Ubuntu.

Before sudo, users would log in to their systems with full permissions over the entire system with the su command. This was risky as users could be exploited by tricking them into entering malicious commands. These vulnerabilities were solved by limiting account privileges. However, administrators still had to log out of their account and into an admin account to perform routine tasks.

The sudo command in Ubuntu strikes a balance – protecting user accounts from malicious or inadvertent damage while allowing a privileged user to run administrative tasks. To learn more about the difference between these commands, check out Sudo vs. Su.

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How to Add User to Sudoers File or Sudo Group on Ubuntu

Linux requires root or superuser privileges to perform certain tasks. We cannot assign root privileges to every user because these are sensitive tasks. Accidental misuse of root privileges can have severe consequences.

Linux provides sudo access so that normal users can install software, delete files, and perform other tasks that require root access.

In this tutorial, we learn how to add a user to the sudoers file or sudo group in Ubuntu.

Prerequisites

• Any Linux system running Ubuntu flavour
• A user with sudo access or a root user account

What is a Sudoers File or Sudo Group

The sudoers (/etc/sudoers) file is a configuration file that contains sudo privilege users and groups. In this file, you can define the level of privileges for the group and user.

Sudo is a default group in the Ubuntu and other modern Linux distributions. Adding standard users to this group gets elevated privileges. You can add a user to the sudo group while creating a new user or an existing user can also be added.

How to Add Users to the Sudo Group

Sudo members can execute commands as the root user using their own password. The easiest way to grant sudo privileges to a user is to add the user to the group named sudo.

Create New User and Assign Sudo Group

1. Log in as the root user or a user with sudo privileges.

2. Create a new user and add the user to sudo in a single command:

This creates a new user named tom and assign to sudo group, then exits with no message.

3. Set password for the new user:

4. Verify the user tom has sudo access:

From the output, the user is able to list the root folder contents which means the user account has sudo access.

In RHEL, CentOS, and other related distributions, the default sudo privileges group is named wheel .

Adding Existing User to Sudo Group

1. Log in as the root user or a user with sudo privileges.

2. To add an existing user to sudo you can use usermod command:

You can verify checking the root access by listing the files under the root directory.

How to Add User to Sudoers File

The sudoers file contains the users and groups that have sudo privileges. Let’s check how to add a user to this file.

1. Log in as the root user or a user with sudo privileges.

2. Open the sudoers file in edit mode:

You may also create a new file inside /etc/sudoers.d directory to add the rules.

3. Locate the User privilege specification section and add the following line:

foo (ALL:ALL) ALL — This means the user foo has all privileges and is able to run any commands.

%developers ALL=(ALL) ALL — You can add a group to sudo by using %groupname

bob ALL=(ALL) NOPASSWD:/bin/df,/bin/ls — Can restrict sudo user to only specific commands and enable no password.

Check User Has Sudo Access

Here are some methods to check sudo access.

Using Sudo Command

The simplest way to check sudo access is by running any command as sudo and if there is an error, then you do not have sudo access.

Sudo command can also be used to check access for other users.

You can see that the user foo can run all commands on this system.

Check User Groups

We can check the group to which user belongs using the groups command.

As we can see, user tom is part of the sudo group and thus has sudo privileges.

Listing Users in Sudo Group

Another way to check if the user has sudo privileges is to list all the members of the sudo group. For example:

The preceding example shows users that are added to the sudo group but remember it doesn’t show users added in the sudoers file.

Remove User from Sudo Group

You can simply run the following command to remove a user from sudo group:

Now the user bob no longer has any sudo privileges. If you added sudo users through the sudoers file then has to be manually removed from that file.

Conclusion

In this tutorial, we learned how to add a user to sudoers file or sudo group on Ubuntu.

Now you can allow authorized users to run root commands. At the same time, you can prevent unauthorized users from causing any damage to your system.

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