December 2018
Beginner
826 pages
22h 54m
English
Content preview from Linux Administration Cookbook
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chattr
Lastly, we changed one of the file's attributes, specifically making the file immutable to even root, before we removed the flag again.
There are many more flags than just immutable; all of them listed in the chattr main page, and some of them can be useful in niche situations:
- a: A file can only be appended to (useful for logs)
- c: To compress and uncompress transparently
- s: Results in the file's blocks are zeroed and written back to disk on file deletion
Not all attributes are honored by all file systems; check if your filesystem supports them too (hint: ext4 doesn't support quite a few).
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