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SYNC(8) System Manager's Manual SYNC(8)

sync — force completion of pending disk writes (flush cache)

sync

Sync can be called to insure 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 or halt 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.

sync(2), fsync(2), halt(8), reboot(8), update(8)

A sync command appeared in Version 6 AT&T UNIX.

BSD 4 May 31, 1993 SYNC(8)