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<br>
Chapters:
<br>
&nbsp;&nbsp;<a href="Introduction.html">1: Introduction</a><br>
&nbsp;&nbsp;<a href="SimpleExample.html">2: Simple example</a><br>
&nbsp;&nbsp;<a href="InvokingGri.html">3: Invocation</a><br>
&nbsp;&nbsp;<a href="GettingMoreControl.html">4: Finer Control</a><br>
&nbsp;&nbsp;<a href="X-Y.html">5: X-Y Plots</a><br>
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&nbsp;&nbsp;<a href="Images.html">7: Image Plots</a><br>
&nbsp;&nbsp;<a href="Examples.html">8: Examples</a><br>
&nbsp;&nbsp;<a href="Commands.html">9: Gri Commands</a><br>
&nbsp;&nbsp;<a href="Programming.html">10: Programming</a><br>
&nbsp;&nbsp;<a href="Environment.html">11: Environment</a><br>
&nbsp;&nbsp;<a href="Emacs.html">12: Emacs Mode</a><br>
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&nbsp;&nbsp;<a href="Installation.html">14: Installation</a><br>
&nbsp;&nbsp;<a href="Bugs.html">15: Gri Bugs</a><br>
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&nbsp;&nbsp;<a href="GriInThePress.html">17: Gri in Press</a><br>
&nbsp;&nbsp;<a href="Acknowledgments.html">18: Acknowledgments</a><br>
&nbsp;&nbsp;<a href="License.html">19: License</a><br>
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Indices:<br>
&nbsp;&nbsp;<a href="ConceptIndex.html"><i>Concepts</i></a><br>
&nbsp;&nbsp;<a href="CommandIndex.html"><i>Commands</i></a><br>
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<h3>9.3.31: `<font color="#82140F"><code>query</code></font>'</h3>

<!-- latex: \index{query} -->

<TABLE SUMMARY="Example" BORDER="0" BGCOLOR="#efefef" WIDTH="100%">
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<PRE>
<font color="#82140F">
`query \synonym|.variable. \
  ["\prompt" ["\default"|.default.]]'
</font></PRE>
</TD>
</TR>
</TABLE>
<p>

Ask the user for the value of a variable (number) or synonym (text
string).  Gri recognizes the type of the item being asked for, either a
variable or synonym, by the presence of a dot or backslash in the second
word of the command line.  If a prompt string is given (in quotes), then
this string is shown to the user.  If a default is given (in
parentheses), then it will be displayed also, and if the user types
carriage-return, then that item will be assigned to the variable or
synonym.  If the default has more than one item, then Gri considers this
a restrictive list of possibilities, and will demand that the answer be
in that list, going into an infinite query loop until an item from the
list (or carriage-return, meaning take first item) is found.  The items
in the list are to be separated by spaces, not commas or any other
non-whitespace characters.
<p>
NOTE: The `<font color="#82140F"><code>-y</code></font>' command-line option bypasses all query commands,
fooling Gri into thinking that the user typed a carriage-return to all
questions.  Thus the defaults, if they exist, are selected.
<p>

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