How to Create a New Sudo User

Steps to Create a New Sudo User

Log in to your server as the root user.

ssh root@server_ip_address

Use the adduser command to add a new user to your system.

Be sure to replace username with the user that you want to create.

adduser username

Set and confirm the new user's password at the prompt. A strong password is highly recommended!

Set password prompts:
Enter new UNIX password:
Retype new UNIX password:
passwd: password updated successfully
Follow the prompts to set the new user's information. It is fine to accept the defaults to leave all of this information blank.

User information prompts:
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]
Use the usermod command to add the user to the sudo group.

usermod -aG sudo username
By default, on Ubuntu, members of the sudo group have sudo privileges.

in centos :
usermod -aG wheel username

to show user group

group

to show list group

cut -d: -f1 /etc/group

Test sudo access on new user account

Use the su command to switch to the new user account.

su - username
As the new user, verify that you can use sudo by prepending "sudo" to the command that you want to run with superuser privileges.

sudo command_to_run
For example, you can list the contents of the /root directory, which is normally only accessible to the root user.

sudo ls -la /root
The first time you use sudo in a session, you will be prompted for the password of the user account. Enter the password to proceed.

Output:
[sudo] password for username:
If your user is in the proper group and you entered the password correctly, the command that you issued with sudo should run with root privileges.