SYNC(8) BSD System Manager's Manual SYNC(8)NAMEsync — force completion of pending disk writes (flush cache)
SYNOPSISsyncDESCRIPTION
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
shutdown(8). Generally, it is preferable to use shutdown(8) to shut down
the system, as they may perform additional actions such as resynchroniz‐
ing the hardware clock and flushing internal caches before performing a
final sync.
The sync utility utilizes the sync(2) function call.
SEE ALSOfsync(2), sync(2), shutdown(8)HISTORY
A sync utility appeared in Version 4 AT&T UNIX.
BSD May 31, 1993 BSD