June 2025
Beginner to intermediate
1180 pages
37h 48m
English
Content preview from Linux
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9.5 Access Rights, Users, and Group Membership
Linux is a multiuser system and therefore needs mechanisms to control who can access which files, who can modify them, and so on. The basis of the access system is the management of users and groups, which is described in Chapter 14, Section 14.5. For now, let's just assume that every user on Linux is assigned to a user account and one or several groups. This minimum requirement is sufficient to understand the concept of file access rights.
9.5.1 Access Rights for Files
The following information is stored with each file or directory:
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The owner of the file
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A group to which the file is to be assigned
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Nine access bits (rwxrwxrwx for read/write/execute for the owner, for all group members ...
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