Linux Permissions Related

First paragraph: Common file types

-Normal file

D catalog File

B-Block file

L Soft links (equivalent to shortcuts in Windows)

Second paragraph: Permissions

* * * Three-bit for a group

Top three: Represents the file's owner's permissions on the file

Intermediate three-bit: the permissions on the file that represent the genus Group of the file

Post three-bit: represents other people's permissions on the file

R readable

W Writable

X executable

-Placeholder

Third paragraph:

. Represents a permissive level created under the

Command: Getenforce view selinux status

　　　　Vim/etc/sysconfig/selinux

SELinux three levels: change after reboot effective

Enforcing open, effective

Permissive warning but no limit

Disabled uninstalling the module does not use

　　　　

Fourth: Number of file hard connections

Fifth paragraph: Owner

Sixth paragraph: Genus Group

Seventh: File Size (bytes) ll-h (more friendly display of file size)

Eighth Paragraph: Creation date

Nineth paragraph: File name

Modify file permissions (i)

chmod u=rwx Shuai.txt

chmod g=rx,o=x Shuai.txt

chmod u=r,g=-,o=-

Modify directory Permissions (i)

Same as changing files

Recursively modifies the directory itself and all directories and files under it

The command is: chown-r

modify file permissions, Modify directory Permissions (ii)

Use +-= To modify

modify file permissions, Modify directory Permissions (iii)

R------> 4

W------> 2

x------> 1

For files:

READ: Can read the contents of the file

Write: Can modify the contents of the file

Execute: You can execute the file as a program

For catalogs:

READ: You can see subdirectories and sub-files under this directory

Write: You can create, delete, and rename files in this directory

Execute: Can CD into the directory

Linux Permissions Related