進入單人模式(single user mode)，這個動作會中斷網路。

root@myhost [~] > shutdown now
*** FINAL System shutdown message from root@myhost ***
System going down IMMEDIATELY



Mar 11 09:41:14 shutdown: shutdown by root:

System shutdown time has arrived
Shutting down daemon processes:
Stopping cron.
Shutting down local daemons:.
Writing entropy file:.
Terminated

Mar 11 09:41:16  syslogd: exiting on signal 15
Enter full pathname of shell or RETURN for /bin/sh:

這是要你選擇一個shell，按Enter鍵表示使用/bin/sh，就按一下Enter鍵吧。

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