将缓冲文件写到磁盘中的命令sync
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更新i-node表，并将缓冲文件写到磁盘中。
sync
Linux系统中欲写入硬盘的资料时，有的时候为了提高效率，会写到文件系统缓冲区中，这个缓冲区是一块硬盘空间，如果欲写入硬盘的资料存于此缓冲区中，而系统又突然断电的话，那么资料就会丢失了，sync指令会将存于缓冲区中的资料强制写入硬盘中。
将缓冲文件写到硬盘总。
#sync
