chattr to secure files

by uday · June 10, 2018

Security is very important, If you want to set secure your files & don’t want to modify that file by anyone ? then use chattr

Step1. To set chattr

[[email protected] local]# ls -ld adminbirds.php
-rw-r--r-- 1 root root 0 Jun 10 11:43 adminbirds.php
[[email protected] local]#

Here I have a file adminbirds.php with 644 permission

chattr +i adminbirds.php

Now the file is immutable

To see the immutable file

[[email protected] local]# lsattr adminbirds.php
----i--------e-- adminbirds.php
[[email protected] local]#

How to remove immutable permission on the file

To remove immutable permission

[[email protected] local]# chattr -i adminbirds.php
[[email protected] local]#

Now see

[[email protected] local]# lsattr adminbirds.php
-------------e-- adminbirds.php
[[email protected] local]#

There is no permission called “i”

That’s all … 🙂