What does sid mean in linux

In Linux, "SID" usually refers to a security identifier. Its functions and uses are: 1. Used to uniquely identify and identify users and groups; 2. Ensure that even if the user name is used on different systems, Or the group name is different, the use of SID for identification can still correctly set and manage permissions; 3. It can ensure the consistency of users and groups between different systems, making it convenient for users to log in, file access and permission management in different systems.

The operating system of this tutorial: Linux5.18.14 system, Dell G3 computer.

In Linux, "SID" usually refers to Security Identifier.

Security identifiers are identifiers used to uniquely identify and identify users, groups, and objects in the system. In Linux systems, each user and group has an independent SID. A SID is a string of numbers and characters used to track and manage security access control in a system.

Role and purpose:

1. User and group identification: SID is used to uniquely identify and identify users and groups. It is used within the system for permission control, authentication and authorization management. SIDs ensure that users and groups are uniquely identified in the system.

2. Access control: SID plays an important role in the Access Control List (ACL). ACL defines the access rights of a user or group to specific objects (such as files and directories). By using SIDs, you can ensure that permissions are set and managed correctly on different systems even if the user or group name is different but identified by the SID.

3. Cross-system compatibility: SID is important across different Linux systems or different network environments. Due to the uniqueness of SID, it can ensure the consistency of users and groups between different systems, making it convenient for users to log in, file access and permission management in different systems.

It should be noted that SID is an identifier used internally by the system, and ordinary users usually do not need to directly operate or pay attention to SID. It is managed and used by the operating system, authentication modules and security-related tools as the basis for secure access control in the system.

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