Linux file properties and how to modify file properties

Ls-al: Displays file name and related properties and lists all file detailed permissions and properties

Dr-xr-x---. 7 root root 4096 Apr3 12:31.

Permissions Connection owner user group file capacity modification date file name

The first character indicates that the file is "directory, file, or connection file, etc."

D: Catalogue

-: File

L: Link File

B: Interface devices available for storage in device files

C: Serial port device in the device file

[d] [r-x] [r-x] [---]

File type file permission file permissions for group permissions Other people's permissions on this file

R: Readable w: writable x: Executable-: No permissions

The directory test owner is root, the owning user group has the Root,root user to this directory has the readable, writable executable permission, the root user group may enter the secondary directory, but cannot perform the write operation, the other user can enter the secondary directory, but cannot perform the write operation.

When modifying file and directory attributes, it is important to understand what data can be changed and what data cannot be changed.

How to change properties and permissions

Chown modifying the owner of a file

-R user name: Group name directory recursively modify permissions for directories and permissions for all files under directory

Chgrp modifying the genus Group of a file

Chmod Modifying file permissions

Number Types Change Permissions:

The file permission character is [-rwxrwxrwx] Nine permissions Three is a group, available numbers represent individual permissions

R=4

w=2

X=1

Each individual privilege score needs to accumulate, such as the permission is [-rwxr-xr--], the score is

Owner=7

Group=5

Other=4

So when we set the permission change, the file permission number is 754

Symbol Type Change permissions:

U owner + Join F

Group G-Remove W file or directory

Chmod o Other people = set X

A everyone

Per-person writable permissions

Linux file properties and how to modify file properties