4.3BSD - /usr/man/cat8/sync.0

SYNC(8)                                                                SYNC(8)


NAME
       sync - update the super block

SYNOPSIS
       /etc/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        May 28, 1986                          SYNC(8)