sync: Synchronize data on disk with memory
sync writes any data buffered in memory out to disk. This can
include (but is not limited to) modified superblocks, modified inodes,
and delayed reads and writes. This must be implemented by the kernel;
sync program does nothing but exercise the
The kernel keeps data in memory to avoid doing (relatively slow) disk
reads and writes. This improves performance, but if the computer
crashes, data may be lost or the filesystem corrupted as a
sync ensures everything in memory is written to disk.
Any arguments are ignored, except for a lone `--help' or `--version' (see section Common options).
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