sync —
force completion of pending disk writes (flush cache)
SYNOPSIS
sync
DESCRIPTION
The
sync
utility 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.
sync
utilizes the
sync(2)
function call.