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  will become<pre>3*pi*x</pre>
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  will become<pre>3*pi*x</pre>
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  after substitution.
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  after substitution.
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  <p>
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  <p>
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  Array addressing: if the variable $(emph)l$emphend contains a
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  Array addressing: if the variable $(emph)l$emphend contains a
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  comma-separated list $(emph)a,b,c,d,e$emphend, then the string
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  comma-separated list $(emph)a,b,c,d,e$emphend, then the string
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  <tt>$$(i[3])</tt> gives <tt>c</tt> after substitution, and
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  <span class="tt">$$(i[3])</span> gives <span class="tt">c</span> after substitution, and
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  <tt>$$(i[2 to 4])</tt> tives <tt>b,c,d</tt>, etc.
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  <span class="tt">$$(i[2 to 4])</span> tives <span class="tt">b,c,d</span>, etc.
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  </p><p>
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  </p><p>
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  Two-dimensional array addressing is also available: if</p>
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  Two-dimensional array addressing is also available: if</p>
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  <pre>$$M=x,y,z;a,b,c</pre>
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  <pre>$$M=x,y,z;a,b,c</pre>
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  (a 2x3 matrix), then
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  (a 2x3 matrix), then
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  <pre>$$(M[1;3,2])=z,y</pre>
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  <pre>$$(M[1;3,2])=z,y</pre>
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  </table>
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  </table>
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  Also, variables $emph module_has_intro$emphend,
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  Also, variables $emph module_has_intro$emphend,
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  $emph module_has_help$emphend and
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  $emph module_has_help$emphend and
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  $emph module_has_about$emphend
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  $emph module_has_about$emphend
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  have value "yes" if the module's directory contains the respective
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  have value "yes" if the module's directory contains the respective
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  .phtml file. These variables are used in the command <tt>!homeref</tt>.
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  .phtml file. These variables are used in the command <span class="tt">!homeref</span>.
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 </li><li>Certain environment variables setup by httpd are readable by wims
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 </li><li>Certain environment variables setup by httpd are readable by wims
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  modules under names starting with $emph httpd_$emphend. For example, the
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  modules under names starting with $emph httpd_$emphend. For example, the
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  environment variable $emph REMOTE_HOST$emphend becomes
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  environment variable $emph REMOTE_HOST$emphend becomes
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  $emph httpd_REMOTE_HOST$emphend under wims. <br/>
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  $emph httpd_REMOTE_HOST$emphend under wims. <br/>
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  Please refer to httpd protocol specifications for details of such variables.
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  Please refer to httpd protocol specifications for details of such variables.
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  variable names starting with the name of the interface to that external
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  variable names starting with the name of the interface to that external
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  package followed by $emph _$emphend will have special meanings for that
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  package followed by $emph _$emphend will have special meanings for that
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  interface, and should be reserved for that purpose.
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  interface, and should be reserved for that purpose.
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  </li>
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  </li>
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</ul>
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</ul>
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