users in Linux
A user account is used to provide security boundaries between different people and programs that can run commands.
Users have user names to identify them to human users and make them easier to work with.Internally, the system distinguishes user accounts by the unique identification number assigned to them, the user ID or UID. If a user account is used by humans, it will generally be assigned a secret
password that the user will use to prove that they are the actual authorized user when logging in.
User accounts are fundamental to system security. Every process (running program) on the system runs as a particular user. Every file has a particular user as its owner. File ownership helps the system enforce access control for users of the files. The user associated with a running process determines the files and directories accessible to that process.
There are three main types of user account: the superuser, system users, and regular users.
• The superuser account is for administration of the system. The name of the superuser is root and the account has UID 0. The superuser has full access to the system.
• The system has system user accounts which are used by processes that provide supporting services. These processes, or daemons, usually do not need to run as the superuser. They are assiged non-privileged accounts that allow them to secure their files and other resources from each other and from regular users on the system. Users do not interactively log in using a system user account.
• Most users have regular user accounts which they use for their day-to-day work. Like system users, regular users have limited access to the system
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