.\"
.\"     @(#)scutil.8
.\"
.Dd January 23, 2008
.Dt SCUTIL 8
.Os "Mac OS X"
.Sh NAME
.Nm scutil
.Nd Manage system configuration parameters
.Sh SYNOPSIS
.Nm
.Br
.Nm
.Fl -prefs Op preference-file
.Br
.Nm
.Fl r
.Op Fl W
.Bro "" Ar nodename | Ar address | Ar local-address remote-address "" Brc
.Br
.Nm
.Fl w Ar dynamic-store-key Op Fl t Ar timeout
.Br
.Nm
.Fl -get Ar pref
.Br
.Nm
.Fl -set Ar pref Op Ar newval
.Br
.Nm
.Fl -dns
.Br
.Nm
.Fl -proxy
.\".Br
.\".Nm
.\".Fl -net
.Sh DESCRIPTION
Invoked with no options,
.Nm
provides a command line interface to the
.Qq dynamic store
data maintained by
.Xr configd 8 .
Interaction with this data (using the SystemConfiguration.framework
SCDynamicStore APIs) is handled with a set of commands read from
standard input.
A list of the available commands is available by entering the
.Ar help
directive.
.Pp
The
.Fl -prefs
option provides a command line interface to the [raw] stored
preference data.
Interaction with this data (using the SystemConfiguration.framework
SCPreferences APIs) is handled with a set of commands read from
standard input.
A list of the available commands is availble by entering the
.Ar help
directive.
.Pp
The
.Fl r
option provides a means of checking the network reachability of a host, an IP
address, or a pair of local and remote IP addresses.
Network
.Qq reachability
is a term that indicates whether network communication is possible between
the current host and the specified host.
.Pp
The
.Fl w
option provides a means of checking for (and optionally waiting for the
creation of or posting of a notification to) a dynamic store key.
.Pp
The
.Fl -get
and
.Fl -set
options provide a means of reporting and updating a select group of
persistent system preferences.
.Pp
The
.Fl -dns
option reports the current DNS configuration.
The first listed
.Xr resolver 5 
configuration is considered to be the
.Qq default
configuration.
Additional
.Qq supplemental
configurations follow.  Those containing a
.Qq domain
name will be used for queries matching the specified domain.
Those without will be used as a
.Qq default
configuration in addition to the first listed.
.Pp
The
.Fl -proxy
option reports the current system proxy configuration.
.\".Pp
.\"Lastly, the
.\".Fl -net
.\"option provides a means of managing the system's network configuration.
.Sh OPTIONS
.Bl -tag -width xx
.It Fl r Oo Fl W Oc Bro "" Ar nodename | Ar address | Ar local-address remote-address "" Brc
Check the network reachability of the specified host name, IP address, or a
pair of local and remote IP addresses.
One or more of the following strings will be reported to standard output.
.Pp
.Bl -tag -width "Transient Connection"
.It Not Reachable
The specified nodename/address cannot be reached using the current network
configuration.
.It Reachable
The specified nodename/address can be reached using the current network
configuration.
.It Transient Connection
The specified nodename/address can be reached via a transient (e.g. PPP)
connection.
.It Connection Required
The specified nodename/address can be reached using the current network
configuration but a connection must first be established.
As an example, this status would be returned for a dialup connection
that was not currently active but could handle network traffic for the
target system.
.It Connection Automatic
The specified nodename/address can be reached using the current network
configuration but a connection must first be established.
Any traffic directed to the specified name/address will initiate the
connection.
.It Local Address
The specified nodename/address is one associated with a network interface
on the system.
.It Directly Reachable Addresss
Network traffic to the specified nodename/address will not go through a
gateway but is routed directly to one of the interfaces on the system.
.El
.Pp
The reachability can also be monitored by specifying the
.Fl W
(watch) option.
This will result in the current status being reported as well as the
status when/if the network configuration changes.
.Pp
A zero exit status will be returned when the reachability status is reported correctly.
A non-zero exit status will be returned if errors are detected with an error reported to standard error.
.It Fl w Ar dynamic-store-key Op Fl t Ar timeout
Check if the specified key exists in the
.Qq dynamic store
data maintained by
.Xr configd 8 .
If present,
.Nm
will return with a zero exit status.
If not present,
.Nm
will wait for the specified time for data to be associated with or a notification
to be posted using the key.
A non-zero exit status will be returned if the key was not created/posted
within the specified time.
.Pp
.Nm
will wait indefinitely if a timeout of 0 seconds is specified.
The default timeout is 15 seconds.
.It Fl -get Ar pref
Retrieves the specified preference.  The current value will be reported on standard output.
.Pp
Supported preferences include:
.Bl -tag -width "LocalHostName" -offset indent
.It ComputerName
The user-friendly name for the system.
.It LocalHostName
The local (Bonjour) host name.
.It HostName
The name associated with
.Xr hostname 1 
and
.Xr gethostname 3 .
.El
.It Fl -set Ar pref Op Ar newval
Updates the specified preference with the new value.
If the new value is not specified on the command line then it will be read from standard input.
.Pp
Supported preferences include:
ComputerName
LocalHostName
HostName
.Pp
The
.Fl -set
option requires super-user access.
.It Fl -dns
Reports the current DNS configuration.
.It Fl -proxy
Reports the current proxy configuration.
.\".It Fl -net
.\"Provides a command line interface to the
.\".Qq network configuration .
.\"Interaction with this data (using the SystemConfiguration.framework
.\"SCNetworkConfiguration APIs) is handled with a set of commands read
.\"from standard input.  A list of the available commands is available
.\"by entering the help directive.
.\".Pp
.\"The
.\".Fl -net
.\"option requires super-user access.
.El
.Sh SEE ALSO
.Xr configd 8
.Sh HISTORY
The
.Nm
command appeared in Mac OS X Public Beta.