DESCRIPTION
The
sync program 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(8) or
halt(8) 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.
The sync program simply invokes the sync(2) system call.