GNU/Linux Command – SYNC

sync — Flush File System Buffers.

Summary:

The Linux Kernel keeps data in memory to avoid doing (relatively slow) disk reads and writes. This improves performance, but if the system crashes, data in memory may be lost or the file system corrupted as a result. sync used to Synchronize data on disk with memory. sync writes any data buffered in memory out to disk.

Examples:

$ sync — Write buffered data to disk.

Read: man sync

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