Linux Reading Notes 5-File Permission

 

1. the user information is stored in/etc/passwd, the password is stored in/etc/shadow, and the group name is stored in/etc/group.

 

2. 7 columns indicating file/directory permissions:

Column 1: d: Directory

-: File

L: linkfile (connection file)

B: stores data to provide random access interface devices.

C: Serial Port Interface Device

S: sockets

P: Pipeline (pipe)

Column 2: I-node: How many different file names are connected to this node I-node

 

3. chgrp: change group

-R: recursion of all directories and files in directory, also applies to the following two Commands

 

4. chown: change owner

Chown user./: group file

 

5. chmod: change mode

Two permission setting methods: numbers and symbols

 

6. File Permission

R: Read File Content

W: Modify the file content (excluding the delete permission)

X: Running File

 

7. directory permission

R: Read the directory structure list

W: Change the directory structure list (you can delete files in the directory)

X: enter this directory

 

8. Open a directory to other users. At least the rx permission should be granted.