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.

AUTHOR