chattr: add page

pages/linux/chattr.md

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+# chattr
+
+> Change attributes of files or folders.
+
+- Make a file or folder immutable to changes and deletion, even by superuser:
+
+`chattr +i {{path}}`
+
+- Make a file or folder mutable:
+
+`chattr -i {{path}}`
+
+- Recursively make an entire folder and contents immutable:
+
+`chattr -R +i {{folder}}`