Follow the bird Brother learn Linux Summary file permissions

Linux is a file, bird brother called the archives. Since it's a file, the file has the following features.
1. User of the file
2. Permissions of the file
3. Types of Archives

1. User of the file
Files can be managed, modified, and queried by people of different roles. Roles are divided into the following three types
1. Owner of the file: User
2. Group: Group
3. Other: Others
Root user has the overriding privileges

2. Permissions of the file
Files can be divided into readable (read), writable (write), executable x (execute) three operation permissions. Files can be assigned different permissions according to different users, such as the user can have a file of R, W, x permissions, and others can only have the R permission of the file.

3. Types of Archives
Files by type can be divided into,-file, D directory, L link file, b storage interface device, C serial Interface device (mouse, keyboard)

Use the LL command to view the details of an answer in the current directory

• rw-rw-r--1 Zhangsenhan Zhangsenhan 8 Mar 21:55 my_file contains the following content
  The first group-the type of the representative file-the file
  The second set of rw-represents the user's right to have the file, that is, R readable, W writable, because My_file is a text file, there is no executable operation, only the binary file has the X executable permission.
  The third group of rw-represents the group's rights to the file, and users within the group inherit the group's permissions
  Group Fourth r--represents others's right to have the file, which is read-only
  Group Fifth 1 represents the number of linked files
  Group Sixth Zhangsenhan represents the owner of the file
  Group Seventh Zhangsenhan represented as the group belonging to the archive
  Group Eighth 8 represents the size of the file by default to byte
  Date of establishment or modification of the representative file of group Nineth
  Name of the tenth group of files

  Change file properties and permissions
  CHGRP: Change the group to which the profile belongs
  Chown: Change the file owner
  chmod: Change permissions for a file

  Change the file group to root
  
  Change the file owner to root
  

  Change Permissions chmod has 2 settings, digital settings and character settings
  Digital setting
  R for the digital 4,w represents the number 2,x represents the number 1 rwx can be represented as three numbers added 7
  For example, set the user permission to 7 group permission set to 7 others permission set to 0
  

  Character setting
  Set the user permission to Rw-group permission to r-x others permission is set to rw-
  
  Add or remove permission values
  

Follow the bird Brother learn Linux Summary file permissions