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F.5. 关机
要关闭 Red Hat Enterprise Linux， root 用户可以执行
/sbin/shutdown 命令。shutdown 的 man page 中有完整的选项列表，其中有两个最常用的选项：
/sbin/shutdown -h now
和
/sbin/shutdown -r now
在关闭所有程序后，
-h 选项会停止机器，而 -r 选项则会重新引导机器。
PAM console users can use the
reboot and halt commands to shut down the system while in runlevels 1 through 5. For more information about PAM console users, refer to the Red Hat Enterprise Linux Deployment Guide.
如果计算机没有自己关闭电源，在出现表示系统已经关闭的信息前不要不要关闭计算机。
如果没有看到这个信息，表示系统还没有卸载所有硬盘分区，此时关机有可能会导致文件系统崩溃。
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