How to protect files from users or unalterable by anybody

How to protect files from users or unalterable by anybody

  
How to make a File "immutable" or "unalterable" -- it cannot be changed
or deleted even by root. Note this works on (ext2/ext3) filesystems.
And, yes, root can delete after it's changed back.


    As root:


      $ chattr +i filename


    And to change it back:


      $ chattr -i filename


    List attributes

      $ lsattr filename

For more info please try man chattr & man lsattr