DESCRIPTION

     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 resynchroniz-
     ing the hardware clock and flushing internal caches before performing a
     final sync.

     Sync utilizes the sync(2) function call.

SEE ALSO

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

HISTORY

     A sync command appeared in Version 6 AT&T UNIX.

4th Berkeley Distribution        May 31, 1993        4th Berkeley Distribution