Summary of basic knowledge points of Linux group

1. Basic Introduction of Linux Group

In Linux, every user must belong to a group and cannot be independent of the group. In Linux, each file has the concept of owner, group, and other groups.

1) Owner

2) Group

3) Other groups

4) Change the user's group

2. File/Directory Owner

Generally, the creator of the file. Whoever creates the file will naturally become the owner of the file.

1. View the owner of the file

1) Command: ls -ahl

2) Application examples:

2. Modify the file owner

Command: chown username filename

Application Examples

Require:

3. Group Creation

1. Basic commands

groupadd group name

2. Application Examples

4. Group of files/directories

When a user creates a file, the group to which the file belongs is the group to which the user belongs by default.

1. View the group of the file/directory

Basic command ls -ahl

2. Modify the group where the file is located

Basic command: chgrp group name file name

3. Application Examples

5. Other groups

In addition to the file owner and group, other users of the system are other groups of the file.

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