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The Linux Programming Interface by Michael Kerrisk

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Chapter 17. Access Control Lists

File Permissions described the traditional UNIX (and Linux) file permissions scheme. For many applications, this scheme is sufficient. However, some applications need finer control over the permissions granted to specific users and groups. To meet this requirement, many UNIX systems implement an extension to the traditional UNIX file permissions model known as access control lists (ACLs). ACLs allow file permissions to be specified per user or per group, for an arbitrary number of users and groups. Linux provides ACLs from kernel 2.6 onward.

Note

Support for ACLs is optional for each file system, and is controlled by kernel configuration options under the File systems menu. Reiserfs support for ACLs has been available ...

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