chattr +ia /etc/passwd
chattr +ia /etc/shadow
chattr +ia /etc/group
chattr +ia /etc/gshadow
chattr +ia /etc/services
lsattr /etc/passwd /etc/shadow /etc/group /etc/gshadow /etc/services
解锁
chattr -ia /etc/passwd
chattr -ia /etc/shadow
chattr -ia /etc/group
chattr -ia /etc/gshadow
chattr -ia /etc/services
