NAME    [Toc]    [Back]

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

SYNOPSIS    [Toc]    [Back]

     sync

DESCRIPTION    [Toc]    [Back]

     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 call.

SEE ALSO    [Toc]    [Back]

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

HISTORY    [Toc]    [Back]

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

OpenBSD      3.6                           May      31,      1993