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     SYNC(8)                                                   SYNC(8)

     NAME
          sync, update - update disk file systems

     SYNOPSIS
          sync

          /etc/update

     DESCRIPTION
          Sync executes the sync(2) system primitive, to suggest that
          all disk writes be completed soon.  It is wise to call sync
          before halting the system.

          Update calls sync(2) every 30 seconds, so that file systems
          are fairly well up to date if the system crashes.  It should
          be run once from rc(8).

     SEE ALSO
          sync(2), reboot(8)