输入exit——回到默认超级用户模式。
输入enable——用默认口令system进入超级用户模式。
Enter enable — Enters super user mode with default password system.
重启之后，连接到交换机，再次输入enable进入超级用户模式。
After reboot, connect to the switch and enter super-user mode again by entering enable.
这样是安全的——就像它的名字“单一用户模式”的含意一样——只有超级用户可以访问系统。
It is safe, since — as the name "single-user mode" suggests — only the superuser is able to access the system.
以超级用户身份执行命令init0以将计算机转入关闭模式中。
Execute the command init 0 as root to send the machine into shutdown mode.
如表1所示，单一用户模式中运行的唯一一个服务是keytable，这样使得超级用户的键盘可以正常使用。
As table 1 shows, the only service that runs for single-user mode is keytable, so that the superusers keyboard will work as expected.
如果文件设置了‘a’属性，数据只能采用追加模式，仅仅超级用户或者拥有CAP _ LINUX _ IMMUTABLE能力的进程可以设置和删除该属性。
A file with the 'a' attribute set can only be open in append mode for writing. Only the superuser or a process possessing the CAP_LINUX_IMMUTABLE capability can set or clear this attribute.
如果文件设置了‘a’属性，数据只能采用追加模式，仅仅超级用户或者拥有CAP _ LINUX _ IMMUTABLE能力的进程可以设置和删除该属性。
A file with the 'a' attribute set can only be open in append mode for writing. Only the superuser or a process possessing the CAP_LINUX_IMMUTABLE capability can set or clear this attribute.
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