freebsd-dev/sbin/conscontrol/conscontrol.8

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.\"
.\" Copyright (c) 2001 Jonathan Lemon <jlemon@FreeBSD.org>
.\" All rights reserved.
.\"
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.\" modification, are permitted provided that the following conditions
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.Dd October 23, 2001
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.Dt CONSCONTROL 8
.Os
.Sh NAME
.Nm conscontrol
.Nd control physical console devices
.Sh SYNOPSIS
.Nm
.Op Cm list
.Nm
.Cm mute on | off
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.Nm
.Cm add | delete
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.Ar console
.Sh DESCRIPTION
The
.Nm
utility is used to examine and modify the physical devices which back
the virtual console devices.
If no arguments
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(or only the
.Cm list
command)
are specified,
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the current console settings are shown.
.Pp
There are two types of logical consoles; a high level console which
is represented by
.Pa /dev/console ,
and a low level console.
The low level console is used for kernel
.Xr printf 9
and
.Xr ddb 4
debugger support,
while the high level console is used by user programs like
.Xr syslogd 8 .
Multiple device support is implemented only for the low level console;
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the high level console is set to the first device in the console list.
.Pp
Multiple console support may be invoked by passing the kernel the
.Fl D
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flag from the boot loader, or by using
.Nm
to change the list of console devices after the system has booted.
.Pp
The following options are available:
.Bl -tag -width indent
.It Cm add | delete Ar console
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Add or delete a physical device from the logical console.
The device must support low-level console operations.
Adding a device will place it at the front of the list of console
devices; the first device is used for the high level console.
.It Cm mute on | off
Change the state of console muting.
All console output is suppressed when console muting is
.Cm on .
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.El
.Sh SEE ALSO
.Xr sio 4 ,
.Xr syscons 4 ,
.Xr boot 8 ,
.Xr loader 8
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.Sh HISTORY
The
.Nm
command first appeared in
.Fx 5.0 .
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.Sh AUTHORS
.An Jonathan Lemon