ユーザとグループ

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. Linux handling of users and groups is the reason it is one of the most secure operating systems.

ユーザ

2つの異なった種類のユーザがあります:

  • Physical Users are people who use the system physically. They have user IDs which are usually unique, as well as group IDs.

  • Logical Users are not tied to a person, but instead are tied to a system function that are used by applications to perform specific tasks. Daemons, mail, news are examples of logical users.

グループ

Groups are logical expressions of organization. They tie users together and provide group-based, rather than user-based permissions. Common groups include admin, audio, mail.