.Nd flush internal filesystem caches to disk frequently
.Sh SYNOPSIS
.Nm update
+.Op Ar normal_interval Op Ar save_energy_interval
.Sh DESCRIPTION
The
.Nm update
uses the
.Xr sync 2
function call to do the task.
+The normal_interval and save_energy_interval can be used to set the
+.Xr sync 2 interval in seconds of the normal case and the case where the computer is trying to save energy.
.Pp
.Nm Update
-is commonly invoked at startup time by
-.Xr rc 8
+is invoked at startup time by
+.Xr launchd 8
when the system goes multi-user.
.Sh SEE ALSO
.Xr sync 2 ,
.Xr fsck 8 ,
-.Xr init 8 ,
-.Xr rc 8 ,
+.Xr launchd 8 ,
.Xr sync 8
.Sh BUGS
It is possible on some systems that a