How to log in your Red Hat Operating system as a Root user
The next step to using your Red Hat Enterprise Linux system is to log in. When you log in, you are introducing yourself to the system (also called authentication). If you type the wrong user name or password, you will not be allowed access to your system.
Unlike some other operating systems, your Red Hat Enterprise Linux system uses accounts to manage privileges, maintain security, and more. Not all accounts are created equal: some accounts have fewer rights to access files or services than others.