shutdownコマンドに-kオプションをつけると,ターミナルを利用している他のユーザーに
メンテナンスのアナウンスを送る事が出来る。
[root@localhost ~]# /sbin/shutdown -r 1 -k “I will reboot this machine for maintenance,Please log out within 1min”
Broadcast message from root (pts/0) (Sun Oct 21 00:00:35 2007):
I will reboot this machine for maintenance,Please log out within 1min
The system is going DOWN for reboot in 1 minute!
Broadcast message from root (pts/0) (Sun Oct 21 00:01:35 2007):
I will reboot this machine for maintenance,Please log out within 1min
The system is going down for reboot NOW!
Shutdown cancelled.