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