update super block
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.
The writing, although scheduled, is not necessarily
completed before sync returns.
The fsync system call completes the writing before it returns.
sync should be used by programs that examine a file system,
and so on.
It is mandatory before a re-boot.
© 2004 The SCO Group, Inc. All rights reserved.
UnixWare 7 Release 7.1.4 - 25 April 2004