Linux学习笔记-shutdown关机命令
1.sync-flush file system buffers 更新文件系统缓冲区作用：Force changed blocks to disk, update the super block. 促使内存块中数据存进磁盘，更新大的内存块。2.shutdown - Halt, power-off or reboot the machine 停止，断电或重启机器。语法：shutdown [OPTIONS…] [TIME] [WALL…]time ：now 立刻 ，HH：mm 定时关机，+m m
