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There are many reasons why you may want to add users to your system: your company may just have hired an employee and they need to login to the system, or your child has become old enough to use a computer and you don’t want him to mess with your own files, folders and preferences, therefore you want to open a new account on your shared computer.
Adding users in all UNIX systems (including Linux, BSD and other Unices) takes a couple of seconds. Due to the wonderful nature of UNIX, adding a user automatically defines personal folders and other personal information, if you fill them out.
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Red Hat Linux
To add a user from the command line, open up a terminal and switch to the root account by issuing the su command and typing the root password. Then use the command useradd followed by a space and the username as the argument.
For example, if you want to add me to your system with the username tolgabalci, then the command will be useradd tolgabalci
After you issue the command, you will be prompted to enter the user’s password twice. When done, your user is added to the system, with their /home directory and login shell defined.
The second option is using the graphical interface. You can either go to System Settings -> Users & Groups or open up a terminal, switch to root, and issue the redhat-config-users command. In both cases you will have the same configuration window.
In the window, click “Add User" in the top left and a dialog box will open to enter the username and password. The home directory of the user is created automatically and their default login shell is defined.
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Debian and Debian-based Distributions
Following our previous example about adding me to the system, open up a terminal and issue the command adduser tolgabalci and enter the password twice.
If your system does not have root access or the root password defined, then you can issue the command with sudo, i.e. sudo adduser tolgabalci
If you are using Gnome, you can go to System -> Administration -> Users and Groups, or if you’re using KDE, you can go to System -> Users and Groups and click on “Add User." Fill out the dialog box as necessary and upon clicking “OK" your user will be created.
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Adding users from the command line is very easy. I suggest using the command line as opposed to the graphical interface because there are some issues that users face said graphical tools, such as not creating the necessary files, while the command line tool worked properly.