update(8) - NetBSD Manual Pages

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UPDATE(8)               NetBSD System Manager's Manual               UPDATE(8)


NAME

     update - flush internal filesystem caches to disk frequently


SYNOPSIS

     update [interval]


DESCRIPTION

     The update command helps protect the integrity of disk volumes by flush-
     ing volatile cached filesystem data to disk periodically, with the speci-
     fied interval (by default 30 seconds).  update uses the sync(2) function
     call to do the task.

     update is commonly invoked at startup time by rc(8) when the system goes
     multi-user.


SEE ALSO

     sync(2),  fsck(8),  init(8),  rc(8),  sync(8)


BUGS

     It is possible on some systems that a sync occurring simultaneously with
     a crash may cause file system damage. See fsck(8).


HISTORY

     An update command appeared in Version 6 AT&T UNIX.

4.4BSD                          April 19, 1994                               1