conscontrol man page on FreeBSD

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CONSCONTROL(8)		  BSD System Manager's Manual		CONSCONTROL(8)

NAME
     conscontrol — control physical console devices

SYNOPSIS
     conscontrol [list]
     conscontrol mute on | off
     conscontrol add | delete console
     conscontrol set console | unset

DESCRIPTION
     The conscontrol utility is used to examine and modify the physical
     devices which back the virtual console devices.  If no arguments (or only
     the list command) are specified, the current console settings are shown.

     There are two types of logical consoles; a high level console which is
     represented by /dev/console, and a low level console.  The low level con‐
     sole is used for kernel printf(9) and ddb(4) debugger support, while the
     high level console is used by user programs like syslogd(8).  Multiple
     device support is implemented only for the low level console; the high
     level console is set to the first device in the console list.

     Multiple console support may be invoked by passing the kernel the -D flag
     from the boot loader, or by using conscontrol to change the list of con‐
     sole devices after the system has booted.

     The following options are available:

     add | delete console
	     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.

	     The console argument is the name of a console device in /dev; the
	     name of the directory may be omitted.

     mute on | off
	     Change the state of console muting.  All console output is sup‐
	     pressed when console muting is on.

     set console | unset
	     Set or unset the virtual console.	When unset, output from the
	     system, such as the kernel printf(9), always goes out to the real
	     main console.  When set, it goes to another.  This is an inter‐
	     face to the tty ioctl TIOCCONS.

SEE ALSO
     sio(4), syscons(4), tty(4), boot(8), loader(8)

HISTORY
     The conscontrol utility first appeared in FreeBSD 5.0.

AUTHORS
     Jonathan Lemon

BSD			       October 23, 2001				   BSD
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