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Chapters:
  1: Introduction
  2: Simple example
  3: Invocation
  4: Finer Control
  5: X-Y Plots
  6: Contour Plots
  7: Image Plots
  8: Examples
  9: Gri Commands
  10: Programming
  11: Environment
  12: Emacs Mode
  13: History
  14: Installation
  15: Gri Bugs
  16: Test Suite
  17: Gri in Press
  18: Acknowledgments
  19: License

Indices:
  Concepts
  Commands
  Variables
 		index.html#Top Unix-install.html#Unix-install Gri: installing Gri Gri: installing Gri index.html#Top Gri: installing Gri

14.2: Archiving Old Versions

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.

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 


mkdir -m 755 -p           /usr/local/share/gri/2.12.4
cp /usr/bin/gri           /usr/local/share/gri/2.12.4
cp /usr/share/gri/gri.cmd /usr/local/share/gri/2.12.4

and then create a shellscript called `/usr/local/bin/gri-2.12.4' containing 


#!/usr/bin/sh
/usr/local/share/gri/2.12.4/gri \
    -directory /usr/local/share/gri/2.12.4 \
    "$@"

to invoke this version of Gri.

To be able to access this old version of gri from within the Emacs gri-mode, you would reset the Emacs variable `gri*directory-tree' like so in the file `~/.emacs' (see Step 2 in see Installing gri-mode.el) 


(setq gri*directory-tree
    '("/usr/local/share/gri/" "/usr/share/gri/"))

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