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Command: sync | Section: 8 | Source: OpenBSD | File: sync.8
SYNC(8) FreeBSD System Manager's Manual SYNC(8)
NAME
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.
SEE ALSO
fsync(2), sync(2), halt(8), reboot(8)
HISTORY
A sync command appeared in Version 4 AT&T UNIX.
FreeBSD 14.1-RELEASE-p8 August 16, 2016 FreeBSD 14.1-RELEASE-p8