NAME
sync —
force completion of pending disk
writes (flush cache)
SYNOPSIS
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.
SEE ALSO
fsync(2),
sync(2),
halt(8),
reboot(8)
HISTORY
A
sync command appeared in
Version 4
AT&T UNIX.