Permissions for Linux directories and users

Three basic permissions in file permission system in System

• Three attributes of a file:

User group owner (group): The user's primary group is the group of this file

# LL

-rw-r--r-- root 0 where the third and fourth columns are the user's owner and owner Group

L each file or directory has a basic permission bit:rw-r--r-

: RWxL read and write execution meaning:

		The meaning of the file	The meaning of the directory
R	Read	can view reading	List of files in a directory can be listed
W	Write	The files can be modified and deleted	Create and delete files in the directory
X	Perform	Files can be run (binary, script)	You can use the command to enter the directory

The permissions of the file are represented by a character, and each character is a group

L Group I: Main (red):L Second Group: Genus Group (blue):L Third Group: Others (green):• the order in which the system permissions are executed when a user accesses a file or directory:

(2) is the user a member of the group? If you are a member of this group, enable group-owned permissions, and if not, perform the next

Use the method that represents the permission, called Mnemonic, and you can also use octal numbers to represent

(),(), (),().

1.3 Allocation of three basic permissions

Root• View file or directory permissions

ll Example:

Total 0

1 root Jul 8 18:28 text.txt

-D first column (other characters): Permissions for the file

Column Three: Owner

Fifth column: Size of File

Seventh column: File name or directory name

• Mnemonic and octal correspondence

Character octal

RW------600

rwxr-r--744

# R4 W2 X1

Belong to the main (and) group (and) other persons ( and) octal

4+2+0=6

4+0+0=4

4+0+0=4

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