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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 Commands.html#Commands Gri: Overview of commands Gri: List of commands index.html#Top Gri: List of commands

9.2: Command syntax

The syntax description is enclosed within angled single quotes, optional items are enclosed in square brackets, multiword items are enclosed in curly braces, and vertical bars separate different legitimate choices. For example, the documentation item for the command for drawing contours 


`draw contour \
    [.value. |  \
      {.min. .max. .inc. [.inc_unlabelled.]}] \
    [unlabelled]'

indicates that following are legal: 


draw contour                   # gri selects levels
draw contour unlabelled        # " but unlabelled
draw contour 10                # single contour line
draw contour 10 unlabelled     # " but unlabelled
draw contour 0 100 10          # contours at z=0,1,
draw contour 0 10 1 unlabelled # " but unlabelled
# contours at 0, 0.1, ... labelled at 0, 1
draw contour 0 10 1 0.1

Note that items enclosed in braces must appear in their entirety; for example, 


draw contour 0 10              # WRONG; missing .inc.

which might look similar `draw contour .min. .max. .inc.' to you, looks like garbage to Gri. Gri will recognize it as an attempt at the `draw contour' command (because the first 2 words match the syntax) but it will then get confused, spit out an error message, and quit.

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