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This article mainly shows you "what is the use of the sync command in Linux", the content is easy to understand, clear, hope to help you solve your doubts, the following let the editor lead you to study and learn "what is the use of sync command in Linux" this article.

The common Linux command sync command is used to force the changed content to be written to disk immediately and update the superblock information.

Sync is used to force the changed content to be written to disk immediately.

It is added that in the Linux/Unix system, in the process of file or data processing, it is generally put into the memory buffer first, and then written to disk when appropriate, so as to improve the running efficiency of the system. The sync command can be used to force data in the memory buffer to be written to disk immediately. Users usually do not need to execute the sync command, and the system automatically performs update or bdflush operations to write the data from the buffer to disk. You need to execute the sync command manually only if update or bdflush cannot be executed or if the user needs an abnormal shutdown.

Syntax sync (option) option-d,-- data synchronizes only file data, not unnecessary metadata-f,-- file-system synchronizes the file system containing these files-- help: display help;-- version: display version information. Buffer and cachebuffer: in order to solve the efficiency of writing disk

Cache: in order to solve the efficiency of reading disk

In order to improve the efficiency of reading and writing disks, the linux system will first put the data in a piece of buffer. When writing to the disk, the data is not immediately written to the disk, but is first written to the buffer. At this point, if you restart the system, it may result in data loss.

The sync command is used to flush the file system buffer so that the data is actually written to disk and buffer can be released, and flush is used to empty buffer. The sync command forces the data to be written to disk and releases the buffer corresponding to that data, so it is common to type the sync command after writing to disk to actually write the data to disk.

If you do not enter the sync command manually to actually write to the disk, the linux system will periodically de-sync the data.

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