Pingmyknowledge Blog Basic UNIX Concepts

UNIX is a multitasking, multiuser operating system. This means that there can be many people using one computer at the same time, running many different applications. (This differs from MS-DOS, where only one person can use the system at any one time.) Under UNIX, for users to identify themselves to the system, they must log in, which entails two steps: Entering your login name (the name which the system identifies you as), and entering your password, which is your personal secret key to logging into your account. Because only you know your password, no one else can login to the system under your username.