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6.7.2 Shutdown programs
6.7.2.4 Synchronize the disks
sync synchronizes the disks by updating the super block and forcing changed blocks to the disk. This should be called before the processor is halted abnormally. Any user can run sync at any time. You can also sync the system from the PROM, if necessary, as shown above.
Unix System Administration - 8 AUG 1996
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