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<H1><A NAME="SECTION0012200000000000000000"></A>
<A NAME="18615"></A>
<BR>
4.20 <A NAME="tex2html1233"
  HREF="http://gmt.soest.hawaii.edu"><B>GMT</B></A> environment parameters
</H1>

<P>
<A NAME="tex2html1234"
  HREF="http://gmt.soest.hawaii.edu"><B>GMT</B></A> relies on several environment parameters, in particular to find data files and program settings.
<DL>
<DT><STRONG>$GMT_SHAREDIR</STRONG></DT>
<DD>points to the <A NAME="tex2html1235"
  HREF="http://gmt.soest.hawaii.edu"><B>GMT</B></A> share directory where all run-time support files
	such as coastlines, custom symbols, <I>PostScript</I> macros, color tables, and much more reside.  If this
	parameter is not set it defaults to the share sub-directory selected during the <A NAME="tex2html1236"
  HREF="http://gmt.soest.hawaii.edu"><B>GMT</B></A> 	install process (e.g., your answer to question C.9 on the web install form).  If no selection
	was made the ultimate default is the share directory under the <A NAME="tex2html1237"
  HREF="http://gmt.soest.hawaii.edu"><B>GMT</B></A> installation directory.
	
</DD>
<DT><STRONG>$GMT_DATADIR</STRONG></DT>
<DD>points to one or more directory where large and/or widely used data files can
	be placed.  All <A NAME="tex2html1238"
  HREF="http://gmt.soest.hawaii.edu"><B>GMT</B></A> programs look in this directories when a file is specified on the
	command line and it is not present in the current directory.  This allows maintainers to
	consolidate large data files and to simplify scripting that use these files since the absolute path need not be specified.
	Separate multiple directories with colons; under Windows you use semi-colons.
	
</DD>
<DT><STRONG>$GMT_USERDIR</STRONG></DT>
<DD>points to a directory where the user may place custom configuration files
	(e.g., an alternate <U>coastline.conf</U> file, preferred default settings in <U>.gmtdefaults4</U>,
	custom symbols and color palettes, and
	shorthands for gridfile extensions via <U>.gmt_io</U>).  Users may also place their own
	data files in this directory as <A NAME="tex2html1239"
  HREF="http://gmt.soest.hawaii.edu"><B>GMT</B></A> programs will search for files given on the command
	line in both <B>$GMT_DATADIR</B> and <B>$GMT_USERDIR</B>.
	
</DD>
<DT><STRONG>$GMT_TMPDIR</STRONG></DT>
<DD>is where <A NAME="tex2html1240"
  HREF="http://gmt.soest.hawaii.edu"><B>GMT</B></A> will write its state parameters via the three files
	<U>.gmtcommands4</U>, <U>.gmtdefaults4</U> and <U>.gmt_bb_info</U>.  If not set
	then these files are written to the current directory. See Appendix&nbsp;<A HREF="node253.html#app:P">P</A> for more on
	the use of <B>$GMT_TMPDIR</B>.
</DD>
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<ADDRESS>
Paul Wessel
2010-07-14
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