Linux sync command
Linux sync command for data synchronization, sync command is in the closed Linux system.
Linux system hard disk data to be written will sometimes efficiency's sake, will write to the filesystem buffer, the buffer is a memory space, if the hard disk data to be written in this buffer in memory, and the system has suddenly broken electricity, then the data will be lost, the data stored in the buffer will sync command in the mandatory written to disk.
grammar
sync