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BSD 2.11 - man page for sync (bsd section 2)

SYNC(2) 					 System Calls Manual					      SYNC(2)

NAME
sync - update super-block
SYNOPSIS
sync()
DESCRIPTION
Sync causes all information in core memory that should be on disk to be written out. This includes modified super blocks, modified i-nodes, and delayed block I/O. Sync should be used by programs that examine a file system, for example fsck, df, etc. Sync is mandatory before a boot.
SEE ALSO
fsync(2), sync(8), update(8)
BUGS
The writing, although scheduled, is not necessarily complete upon return from sync. 4th Berkeley Distribution June 30, 1985 SYNC(2)


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