sync - update super block
sync causes all information in memory that should be on disk to be
written out. This includes modified super blocks, modified i-nodes, and
delayed block I/O.
It should be used by programs that examine a file system, such as
fsck(1M), df(1M), etc. It is mandatory before a re-boot.
The writing, although scheduled, is not necessarily completed before sync
returns. The fsync system call completes the writing before it returns.
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