How are usernames and passwords associated with a UNIX account?
Every person who uses a Unix computer should have her own account. An account is identified by a user ID number (UID) that is associated with one or more usernames (also known as account names ). Traditionally, each account also has a secret password associated with it to prevent unauthorized use.
Do you need to know both your username and password?
You need to know both your username and your password to log into a Unix system. The username is an identifier: it tells the computer who you are. In contrast, a password is an authenticator: you use it to prove to the operating system that you are who you claim to be.
Are there any problems with usernames and passwords?
Usernames containing certain unusual characters will also cause problems for various application programs, including some network mail programs. For this reason, many sites allow only usernames that contain lowercase letters and numbers and further require that all usernames start with a letter.
When did we start using usernames and passwords?
Most sources pinpoint this to the Compatible Time-Sharing System that was operated at MIT between 1961 and 1973. Over the decades, usernames and passwords have shifted from those first mainframes and networks to the home computer to logging into your favorite social media account on your smartphone.
Can a username be any sequence of characters?
A username can be any sequence of characters you want (with some exceptions), and does not necessarily correspond to a real person’s name. Some versions of Unix have problems with usernames that do not start with a lowercase letter or that contain special characters such as punctuation or control characters.
Can a single person have more than one UNIX account?
A single person can have more than one Unix account on the same computer. In this case, each account would have its own username. Standard Unix usernames may be between one and eight characters long, although many Unix systems today allow usernames that are longer.
What does it mean to have special account in Unix?
Unix also has special accounts that are used for administrative purposes and special system functions. These accounts are not normally used by individual users. After you tell Unix who you are, you must prove your identity to a certain degree of confidence (trust). This process is called authentication.