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BSD关机重启脚本/etc/rc.d/rc.0

#!/bin/sh
# 关闭所有程序
echo "Sending all processes the TERM signal..."
/sbin/killall5 -15
sleep 1

echo "Sending all processes the KILL signal..."
/sbin/killall5 -9
sleep 1

# 卸载swap
echo "Deactivating swap partitions..."
/sbin/swapoff -a

# 保存随想数种子
echo "Saving random seed to a temporary file..."
/bin/dd if=/dev/urandom of=/etc/random-seed count=1 bs=512 2>/dev/null

# 保存系统时钟
echo "Saving the system time to hardware clock..."
/sbin/hwclock --systohc --utc

# 卸载远程系统
echo "Unmounting remote filesystems..."
/bin/umount -a -f -tnfs

# -w参数并不会真的重开机，只是把记录写到 /var/log/wtmp 档案里
# 0级和6级这里是一个文件，通过脚本名来判断是关机还是重启，所以有了下面结构。
case "$0" in
	*6)
		/sbin/reboot -w
	;;
	
	*0)
		/sbin/halt -w
	;;
esac

# 以只读方式挂载系统
echo "Remounting root filesystem read-only..."
/bin/mount -n -o remount,ro /
#将刷新缓存，保存数据
echo "Flushing filesystem buffers..."
/bin/sync
#卸载本地文件系统
echo "Unmounting local filesystems..."
/bin/umount -a -tnonfs
# 关机
case "$0" in
	*6)
		echo "Please stand by while rebooting..."
		/sbin/reboot -d -f -i
	;;
	
	*0)
		echo "Bye..."
		/sbin/halt -d -f -p
	;;
esac