Lock Up Files And Prevent Changes With This Simple Command

[Linux] There are times when you want to lock up files and prevent other people, or the system from making changes to them. Here is one simple command that you can use to lock up either a single file or folder:

To unlock:

Explanation: chattr is a command that allows a user to set certain attributes on a file residing on a Linux filesystem. A “+i” flag adds an immutable attribute to the file. When this is enabled, even a root user cannot change the file. Similarly, a “-i” flag subtracts the specific attribute from the file.

chattr-example lock up files

If you have a folder of files that you want to lock up, you can also add the “+R” flag. For example:

Note: Only the superuser or a process pessessing the CAP_LINUX_IMMUTABLE capability can set or clear this attribute.