4.4BSD/usr/share/man/cat8/sync.0

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

NNAAMMEE
     ssyynncc - force completion of pending disk writes (flush cache)

SSYYNNOOPPSSIISS
     ssyynncc

DDEESSCCRRIIPPTTIIOONN
     SSyynncc can be called to insure that all disk writes have been completed be-
     fore 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 resynchroniz-
     ing the hardware clock and flushing internal caches before performing a
     final ssyynncc.

     SSyynncc utilizes the sync(2) function call.

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

HHIISSTTOORRYY
     A ssyynncc command appeared in Version 6 AT&T UNIX.

4th Berkeley Distribution        May 31, 1993                                1