SYNC(8)                              BSD                               SYNC(8)



NAME
     sync - update the super block

SYNOPSIS
     /etc/sync

DESCRIPTION
     sync executes the sync system primitive.  sync can be called to ensure
     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)