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<br>
Chapters:
</br>
<a href="Introduction.html">1: Introduction</a><br>
<a href="SimpleExample.html">2: Simple example</a><br>
<a href="InvokingGri.html">3: Invocation</a><br>
<a href="GettingMoreControl.html">4: Finer Control</a><br>
<a href="X-Y.html">5: X-Y Plots</a><br>
<a href="ContourPlots.html">6: Contour Plots</a><br>
<a href="Images.html">7: Image Plots</a><br>
<a href="Examples.html">8: Examples</a><br>
<a href="Commands.html">9: Gri Commands</a><br>
<a href="Programming.html">10: Programming</a><br>
<a href="Environment.html">11: Environment</a><br>
<a href="Emacs.html">12: Emacs Mode</a><br>
<a href="History.html">13: History</a><br>
<a href="Installation.html">14: Installation</a><br>
<a href="Bugs.html">15: Gri Bugs</a><br>
<a href="TestSuite.html">16: Test Suite</a><br>
<a href="Acknowledgments.html">17: Acknowledgments</a><br>
<a href="License.html">18: License</a><br>
<br>
Indices:</br>
<a href="ConceptIndex.html"><i>Concepts</i></a><br>
<a href="CommandIndex.html"><i>Commands</i></a><br>
<a href="BuiltinIndex.html"><i>Variables</i></a><br>
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<h2>14.2: Archiving Old Versions</h2>
Gri, like other complex programs, sometimes changes in such a way as to
break old scripts. This is less so of changes since about 1998 or so,
since the syntax became pretty firm about that time.
<p>
Still, disk costs are so cheap that you would be well-advised to keep a
backup version of Gri, whenever you update. This is pretty simple; you
need to keep a copy of the executable and the library file, and you need
to write a tiny shellscript that calls this particular executable with
this particular library file. For example, you might do the following
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<PRE>
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mkdir -m 755 -p /usr/local/share/gri/2.8.0
cp /usr/bin/gri /usr/local/share/gri/2.8.0
cp /usr/share/gri/gri.cmd /usr/local/share/gri/2.8.0
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<p>
and then create a shellscript called
`<font color="#82140F"><samp>/usr/local/bin/gri-2.8.0</samp></font>' containing
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#!/usr/bin/sh
/usr/local/share/gri/2.8.0/gri \
-directory /usr/local/share/gri/2.8.0 \
"$@"
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<p>
to invoke this version of Gri.
<p>
To be able to access this old version of gri from within the Emacs
gri-mode, you would reset the Emacs variable `<font color="#82140F"><code>gri*directory-tree</code></font>'
like so in the file `<font color="#82140F"><samp>~/.emacs</samp></font>'
(see <a href="InstallingGriMode.html#Step2">Step 2</a> in
see <a href="InstallingGriMode.html#Installinggri-mode.el">Installing gri-mode.el</a>)
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<font color="#82140F">
(setq gri*directory-tree
'("/usr/local/share/gri/" "/usr/share/gri/"))
</font></PRE>
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