NAME
sync
- force completion of pending disk writes (flush cache)
SYNOPSIS
sync
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
.
The
sync
program simply invokes the
sync(2)
system call.
SEE ALSO
fsync(2),
sync(2),
halt(8),
reboot(8)
HISTORY
A
sync
command appeared in
Version 6 AT&T UNIX
.