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BSD 2.11 - man page for sync (bsd section 8)

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SYNC(8) 										  SYNC(8)

NAME
       sync - update the super block

SYNOPSIS
       sync

DESCRIPTION
       Sync  executes  the  sync  system  primitive.   Sync can be called to insure that all disk
       writes have been completed before the processor is halted in a way not  suitably  done  by
       reboot(8)  or halt(8).  Generally, it is preferable to use reboot or halt to shut down the
       system, as they may perform additional actions such as resynchronizing the hardware  clock
       and flushing internal caches before performing a final sync.

       See sync(2) for details on the system primitive.

SEE ALSO
       sync(2), fsync(2), halt(8), reboot(8), update(8)

4th Berkeley Distribution		November 27, 1996				  SYNC(8)
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