immutable []

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Chattr is a command that can be used to set file attributes that can prevent all users (even root) from deleting a file.

        
              lsattr file

Example output of immutable file:

        
              ----i---------- filename

To prevent everyone (even root) from deleting a file:

        
              chattr +i file

This will now make the file 'read-only'.

To undo this:

        
              chattr -i file

You can use the +a attribute to allow users to append information into a file only:

        
              chattr +a