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Posted by Eric Lubow
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There are files that get changed very infrequently. For instance, if your system won't have any users added anytime soon then it may be sensible to chattr immutably the /etc/password and /etc/shadow files. Only the superuser or a process possessing the CAP_LINUX_IMMUTABLE capability can set or clear this attribute.
chattr +i /etc/passwd /etc/shadow
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