(轉)How To Create a Sudo User on Ubuntu

轉自：https://linuxize.com/post/how-to-create-a-sudo-user-on-ubuntu/

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The sudo command is designed to allow users to run programs with the security privileges of another user, by default the root user.

In this guide, we will show you how to create a new user on an Ubuntu machine and give it sudo access. You can then use this user account to execute administrative commands without a need to logging in to your Ubuntu server as a root user.

Steps to create a sudo user

Follow the steps below to create a new user account and give it sudo access. If you want to configure sudo for an existing user, skip to step 3.

1. Log in to your server.

Log in to your system as the root user:

ssh root@server_ip_address

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2. Create a new user account.

Create a new user account using the adduser command. Don’t forget to replace usernamewith the user name that you want to create: 

adduser username

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You will be prompted to set and confirm the new user password. Make sure that the password for the new account is as strong as possible.

Adding user `username' ...
Adding new group `username' (1001) ...
Adding new user `username' (1001) with group `username' ...
Creating home directory `/home/username' ...
Copying files from `/etc/skel' ...
New password:
Retype new password:
passwd: password updated successfully

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Once you set the password the command will create a home directory for the user, copy several configuration files in the home directory and prompts you to set the new user’s information. If you want to leave all of this information blank just press ENTER to accept the defaults.

Changing the user information for username
Enter the new value, or press ENTER for the default
    Full Name []:
    Room Number []:
    Work Phone []:
    Home Phone []:
    Other []:
Is the information correct? [Y/n]

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3. Add the new user to the sudo group

By default on Ubuntu systems, members of the group sudo are granted with sudo access. To add the user you created to the sudo group use the usermod command:

usermod -aG sudo username

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Test the sudo access

Switch to the newly created user:

su - username

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Use the sudo command to run the whoami command:

sudo whoami

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Is the user have sudo access then the output of the whoami command will be root:

root

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How to use sudo

To use sudo, simply prefix the command with sudo and space:

sudo ls -l /root

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The first time you use sudo in a session, you will be prompted to enter the user password:

[sudo] password for username:

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Conclusion

You have learned how to create a user with sudo privileges. You can now log in to your Ubuntu server with this user account and use sudo to run administrative commands.

That’s all! Feel free to leave a comment if you have any questions.