The adduser Command | Creating new users in Ubuntu Linux
As a system administrator working on an Ubuntu server, you must know how to add new users for the system. There are two commands.
The adduser which is an interactive command is the most straightforward method for creating a new user in Ubuntu, the other one is useradd command, it is a non interactive command.
Adding users with adduser
Creating a user is an easy task, thanks to the adduser command. In the following example, I am going to create a new user named administrator.
All you need to do is type adduser followed by the username, as shown in the following example:
After you execute the adduser command, it will ask you to enter a password for the new user, then you need to retype the password.
Then, it will prompt for some more information such as full name of the user. you don't have to answer those questions.
To skip these questions, simply press Enter without typing anything.
And that is it, the new user account is ready to use. However, this user does not have root privileges.
Granting sudo permissions
If the new user needs to perform administrative tasks such as installing software and managing other user accounts, you need to add the user to the sudo Linux group. We can do that using the usermod command.
usermod -aG sudo administrator
The user can now get root privileges using the sudo command.
Note that Ubuntu keeps user details in /etc/passwd file. Passwords are kept in /etc/shadow file.
The adduser command creates the user's home folder under the /home directory. By default, this is /home/<username>, but you can change this by using the --home Flag.
adduser administrator --home /var/admin
This command creates a new user account, administrator, and creates a home folder at /var/admin for the user.
Do not set the password
The --disabled-login option, if used do not prompt for a password when you create a new user.
adduser administrator --disabled-login
User can't login to the system, until you set up a password with the passwd command.