Ubuntu Manpage: d.mon - To establish and control use of a graphics display monitor.

NAME

       d.mon  - To establish and control use of a graphics display monitor.

KEYWORDS

       display

SYNOPSIS

       d.mon
       d.mon help
       d.mon   [-lLprs]    [start=string]     [stop=string]    [select=string]    [unlock=string]    [--verbose]
       [--quiet]

   Flags:
       -l
           List all monitors

       -L
           List all monitors (with current status)

       -p
           Print name of currently selected monitor

       -r
           Release currently selected monitor

       -s
           Do not automatically select when starting

       --verbose
           Verbose module output

       --quiet
           Quiet module output

   Parameters:
       start=string
           Name of graphics monitor to start

       stop=string
           Name of graphics monitor to stop

       select=string
           Name of graphics monitor to select

       unlock=string
           Name of graphics monitor to unlock

DESCRIPTION

d.mon allows the user to start, select, list, query the status of, release control of, stop, and unlock
control of, available graphics monitors. The user can run this program either interactively (through a
series of menus), or non-interactively by typing the name of the monitor to start, stop, select, or
unlock, and any desired flags on the command line.

These parameters perform the following functions:

1 Start a Monitor.
In order to display on-screen GRASS graphics, the user must start and select a graphics monitor.
By default, the start command actually runs two commands, to both start and select whatever
monitor is named by the user. (The user can get a list of available monitors by setting the -l or
-L flag on the command line.) Note that some monitor drivers use environment variables or the
specific driver documentation.

When a monitor is started, it is therefore also (automatically) selected for output, unless the -s flag
is set by the user; the user can also explicitly select a monitor that has been started (see (3) below).
After a monitor is started, a blank graphics frame should appear on whatever terminal the user is using
to display graphics.

The desired monitor should be started once and need not be restarted unless it is stopped (option 2) for
some reason. A monitor may continue to run for any length of time, even when no GRASS session is being
run. The monitor program runs in the background.

2 Stop a Monitor.
Sometimes the monitor program needs to be stopped (terminated). Choosing option 2 will terminate
a user-specified monitor program. A graphics monitor has two different types of status: monitor
program not running, and monitor running. A monitor that has been started and/or selected will be
listed as running; a monitor that has been stopped (or not started) will be listed as not running.
The -L (list status) flag will list the status of each monitor connected to the system.

3 Select a Monitor.
When the user starts a monitor, it is also (automatically) selected for graphics output unless the
user sets the -s flag. In order to use (direct graphics output to) a monitor, the user must
select that monitor for use, either by simply starting the monitor without the -s flag or by
explicitly selecting the monitor for output using option 3. Only running monitors can be selected
for graphics output. Once the user has selected a monitor for output, no other user can use this
monitor for graphics output until the monitor driver is either released (by the user) or unlocked
(by any user on the system).

The user can run multiple graphics monitors by simply starting each of the graphics monitors drivers he
wishes to direct output to.

4 Release a Monitor.
Once a user has selected a monitor for graphics output, it is locked for use by that user until
either: (1) the user voluntarily releases control of the monitor for use by another (option 4), or
(2) another GRASS user unlocks the user's control of the monitor. Menu option 4 appears only to
the person who has selected the monitor (since only that user can release control of his selected
graphics monitor.) If another user wishes to unlock the user's control of the monitor, that user
must run d.mon from the command line and set the unlock=name parameter.

You may choose multiple options within the d.mon program.

NOTES

       The d.mon program can regulate control of graphics monitors both in systems using multiple  monitors  and
       in  systems  using  a single graphics monitor. To increase the number of monitors available to each user,
       the ASCII file $GISBASE/etc/monitorcap needs to be modified.

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