패스워드에 lock 걸어 잠그기

[root@push06 skel]# passwd -l kbs

Locking password for user kbs.

passwd: Success

[root@push06 skel]# grep kbs /etc/shadow

kbs:!!$1$aPkNiTws$ZV5bM4sc48RINJ0vK5U3f0:15947:0:99999:7:::

[root@push06 skel]# passwd -u kbs

Unlocking password for user kbs.

passwd: Success.