Objective 1: Manage User and Group Accounts and Related System Files
Whether on a corporate server or personal desktop machine, managing user accounts is an important aspect of running a Linux system. The root, or superuser, account is established when you first install Linux. Unlike single-user systems (such as MS-DOS), multiuser systems require the notion of an owner for files, processes, and other system objects. An owner may be a human system user or a system service, such as a web server. Each of these owners is differentiated from others by a unique user account, which is assigned to it by the system administrator.