Add a user into sudo on Linux

Create a new user

root@server:~# adduser username

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

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] y

Add the user into the sudo group

root@mserver:~# adduser username sudo

Adding user `username' to group `sudo' ...

Adding user username to group sudo

Done.

Switch to the new user account 

root@mal-eum:~# su - username

To run a command as administrator (user "root"), use "sudo <command>".

See "man sudo_root" for details.

username@server:~$