chattr

Change attributes of files or directories. More information: https://manned.org/chattr.

Make a file or directory immutable to changes and deletion, even by superuser:
chattr +i {{path/to/file_or_directory}}
Make a file or directory mutable:
chattr -i {{path/to/file_or_directory}}
Recursively make an entire directory and contents immutable:
chattr -R +i {{path/to/directory}}

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