Linux file permissions

each Linux files have four access rights: readable (r) 4, writable (W) 2, executable (x) 1, and no Permissions (-)

-   rw- r-- r-- 1 root root 7 20:21 monitor_log.sh

first column: File type -Indicates that file D represents a directory

2-4-bit: Permissions for file owners

5-7-bit: Permissions for the group to which the file belongs

8-10-bit: Other user rights

Second column: Connection occupancy node

Column three: The main file belongs to

Fourth column: Group to which the file belongs

Fifth column: Size of File

VI, seven or eight columns: Last Modified date (month date time)

Nineth Column: File name

1. Change read and write execution permissions for a file Chmod:chmod 777 Test.txt

-R parameter for cascading

2. Change the file (directory) belongs to group: CHGRP [group name] [filename] can only change the directory itself and directories or files under the directory does not change the-r option can be implemented

3. Change the file's owning primary Chown:chown [-r] Account name file name

Chown [-r] Account name: Group name File name (-R acting on directory purpose is cascade change)

4.umask (set permission complement)

5.chattr (modify file special attributes)

+-= Increase reduction setting

' A ' atime cannot be modified after adding this attribute to the file or directory

' S ' writes data synchronously to disk

' A ' can only append cannot be deleted (non-root user cannot set)

' C ' automatically compresses the file (it will be extracted automatically when read)

' I ' makes the file cannot be deleted, renamed, set Link, write, new data

This article is from the "Exclusive View" blog, please be sure to keep this source http://molujiang.blog.51cto.com/9742572/1878437

Linux file permissions