
Since Linux™ is a true multi-user system, the principles of both users and groups are important to the internal operation of the system, and also to the day-to-day use of the system. The way Linux™ handles users and groups makes it one of the most secure operating systems.
Hay dos tipos diferentes de usuarios
Physical Users are people who use the system physically. They have user IDs which are usually unique, as well as group IDs.
Los Usuarios lógicos no están ligados a personas, sino que lo están a funciones del sistema que son usadas por aplicaciones para realizar tareas específicas. «Daemons», «mail» y «news» son ejemplos de usuarios lógicos.