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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>GRASS variables and environment variables</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>
<body bgcolor="white">
<H2>GRASS variables and environment variables</H2>
<!-- file source:
./lib/init/variables.html
-->
<P>
There are two types of variables:
<ul>
<li>environment variables,</li>
<li>GRASS variables.</li>
</ul>
Any setting which needs to be modifiable by a GRASS program (e.g. MONITOR)
has to be a GRASS variable.
<h2>Setting environment variables</h2>
<br>Setting environment variables depends on the shell being used:
<br> Bash: <tt>export VARIABLE=value</tt>
<br> or
<br> Csh: <tt>setenv VARIABLE value</tt>
<h2>Setting environment variables permanently</h2>
<ul>
<li>
To get personal BASH shell definitions (aliases, color listing option, ...)
into GRASS, store them in:<br>
<tt>$HOME/.grass.bashrc</tt></li>
<li>
To get personal CSH shell definitions (aliases, color listing option, ...)
into GRASS, store them in:<br>
<tt>$HOME/.grass.cshrc</tt></li>
</ul>
<h2>Setting GRASS variables</h2>
You have to use "g.gisenv" (within GRASS which then permanently predefines
GRASS variables in the <tt>.grassrc6</tt> file):<br>
<p>
Use: <tt>g.gisenv set=VARIABLE=VALUE</tt>
<p>
It looks unusual with two equals signs, but g.gisenv does dual duty for
getting and setting GRASS variables.
<P>
If the user just specifies a variable name, it defaults to "get" mode. Example:
<p>
<tt>
GRASS ~> g.gisenv GRASS_GUI<br>
text
</tt>
<hr WIDTH="100%">
<h2>List of selected (GRASS related) environment variables</h2>
<p>GISBASE
<br> directory where GRASS lives
<p>GISRC
<br> name of .grassrc6 file
<p>GRASS_ADDON_PATH
<br>[grass5] startup script
<br> allows to specify additional paths to local GRASS modules extra to standard distribution
<p>GRASS_ANOTHER_BUTTON
<br>[various modules]
<br> If the environment variable GRASS_ANOTHER_BUTTON exists,
the mouse button setting will be changed for two-button mice.
<p>GRASS_BACKGROUNDCOLOR
<br>[PNGdriver]
<br> defines the background color of the image created by the PNG driver
<p>GRASS_ERROR_MAIL
<br> set to any value to send user mail on an error or warning that
happens while stderr is being redirected.
<p>GRASS_GNUPLOT
<br>[m.svfit, s.probplt, s.sv]
<br> program to use for plotting "gnuplot" data
<p>GRASS_HEIGHT
<br>[d.mon]
<br> defines the height of GRASS monitor, see also GRASS_WIDTH
<P>GRASS_HTML_BROWSER
<br>[init.sh, d.m]
<br> defines name of HTML browser
<P>GRASS_INT_ZLIB
<br>[libgis]
<br> If the environment variable GRASS_INT_ZLIB exists, new compressed
rasters will be compressed using zlib instead of RLE compression. Such
rasters will have a "compressed" value of 2 in the cellhd file.<br>
Obviously, decompression is controlled by the raster's "compressed"
value, not the environment variable.
<p>GRASS_MESSAGE_FORMAT
<br>[various modules]
<br>Maybe set to either "standard" or "gui" (normally GRASS takes care)
<p>GRASS_PAGER
<br>[various modules]
<br>Maybe set to either "less" or "more"
<p>GRASS_PERL
<br> set perl with path
<p>GRASS_PNGFILE
<br>[PNGdriver]
<br> name of PNG output file
<!-- HB Sept 2005: I don't think this exists anymore:
<p>GRASS_STDERR
<br> set to any value to prevent user mail on error
-->
<p>GRASS_TCLSH
<br>[nviz]
<br> set tclsh shell name to override 'tclsh'
<p>GRASS_TRANSPARENT
<br>[PNGdriver]
<br> if "TRUE", the image created by the PNG driver will have a transparent background
<p>GRASS_TRUECOLOR
<br>[PNGdriver]
<br> if "TRUE", the PNG driver generates a true-color image
<p>GRASS_UI_TERM
<br> set to any value to use the terminal based parser
<p>GRASS_VERSION
<br> reports the current version number (used by R-stats interface etc);
<br> should not be changed by user
<p>GRASS_WIDTH
<br>[d.mon]
<br> defines the width of GRASS monitor, see also GRASS_HEIGHT
<p>GRASS_WISH
<br>[d.m, nviz]
<br> set wish shell name to override 'wish'
<h2>List of selected GRASS variables</h2>
[ Use <tt>g.gisenv</tt> to set/unset/change them ]
<p>DEBUG
<br>[entire GRASS]
<br> sets level of debug message output (0: no debug messages)
<br><tt>g.gisenv set=DEBUG=0</tt>
<p>DM_FORM_MODE
<br>[d.m]
<br> sets default form mode (txt or gui)
<br><tt>g.gisenv set=DM_FORM_MODE=txt</tt>
<p>GISDBASE
<br> initial database
<p>GIS_LOCK
<br> lock ID to prevent parallel GRASS use,
<br> process id of the start-up shell script
<p>GRASS_DB_ENCODING
<br>[d.what.vect/forms library]
<br> encoding of query form (utf-8, ascii, iso8859-1, koi8-r)
<p>GRASS_GUI
<br> either "text" or "tcltk" to define non-/graphical startup
<p>LOCATION
<br> full path to location directory
<p>LOCATION_NAME
<br> initial location name
<p>MAPSET
<br> initial mapset
<p>OVERWRITE
<br>[all modules]
<br> toggles map overwrite.
<br> With 0 maps are protected (default),
<br> With 1 maps with identical names will be overwritten.
<br> You can force a protected overwrite by adding "--o" to the command.
<br>e.g.:
<br> <tt>g.gisenv set="OVERWRITE=0"</tt>
<h2>GRASS-related Files</h2>
<p>$HOME/.grassrc6
<br> stores the GRASS variables (but not environment variables)
<p>$HOME/GIS_ERROR_LOG
<br> If this file exists then all GRASS error and warning messages are
logged here. Applies to current user. To generate the file, use:
<br> <tt>touch $HOME/GIS_ERROR_LOG</tt>
<p>$GISBASE/GIS_ERROR_LOG
<br> If this file exists then all GRASS error and warning messages are
logged here. Applies to all users. (proper write permissions must be in place)
<P>
<i>Note:</i>
Error and warning messages encountered while using the GUI menus are not logged.
<h3>SEE ALSO</h3>
<a href="g.gisenv.html">g.gisenv</a>
<p><i>Last changed: $Date: 2005/09/23 04:52:24 $</i>
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