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NetBSD 6.1.5 - man page for sync (netbsd section 8)

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

NAME
     sync -- force completion of pending disk writes (flush cache)

SYNOPSIS
     sync

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 addi-
     tional 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 6 AT&T UNIX.

BSD					   May 31, 1993 				      BSD
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