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  <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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  PRISM Manual | ConfiguringPRISM / Introduction 
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      <p><a class='wikilink' href='Main.html'>Configuring PRISM</a> /
  </p><h1>Introduction</h1>
  
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  <p>The operation of PRISM can be configured in a number of ways. From the GUI, select "Options" from the main menu to bring up the "Options" dialog. The settings are grouped under several tabs. Those which affect the basic model checking functionality of the tool are under the heading "PRISM". Separate settings are available for the simulator and various aspects of the GUI (the model editor, the property editor and the log).
  </p>
  <p class='vspace'>User options and settings for the GUI are saved locally and reused. They are stored in the file <code>.prism</code>, which can be found in your home directory (<code>~</code>) under Unix, Linux or Mac OS X and in e.g. <code>C:\Documents and Settings\username</code> under Windows. Currently the "Options" dialog in the GUI represents the easiest way to modify the settings, but the <code>.prism</code> file is in a simple textual format and can be edited by hand. To restore the default options for PRISM, click "Load Defaults" and then "Save Options" from the "Options" dialog in the GUI. Alternatively, delete the <code>.prism</code> file and then re-launch the GUI.
  </p>
  <p class='vspace'>From the command-line version of PRISM, options are controlled by switches. A full list can be displayed by typing:
  </p>
  <div class='vspace'></div>
  <div class='sourceblock ' id='sourceblock1'>
    <div class='sourceblocktext'><div class="shell"><span style="font-weight:bold;">prism -help</span><br/>
  </div></div>
    <div class='sourceblocklink'><a href='http://prismmodelchecker.localhost/manual/ConfiguringPRISM/Introduction?action=sourceblock&amp;num=1' type='text/plain'>[&#036;[Get Code]]</a></div>
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  <p class='vspace'>For some switches, whose format is not straightforward, there is additional help available on the command-line, using <code>-help switch</code>. For example:
  </p>
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  <div class='sourceblock ' id='sourceblock2'>
    <div class='sourceblocktext'><div class="shell"><span style="font-weight:bold;">prism -help const</span><br/>
  <span style="font-weight:bold;">prism -help simpath</span><br/>
  <span style="font-weight:bold;">prism -help exportresults</span><br/>
  <span style="font-weight:bold;">prism -help exportmodel</span><br/>
  </div></div>
    <div class='sourceblocklink'><a href='http://prismmodelchecker.localhost/manual/ConfiguringPRISM/Introduction?action=sourceblock&amp;num=2' type='text/plain'>[&#036;[Get Code]]</a></div>
  </div>
  
  <p class='vspace'>The <code>.prism</code> settings file is <em>ignored</em> by the command-line version (unlike earlier versions of PRISM, where it was used). You can, however, request that the settings file <em>is</em> read, using the <code>-settings</code> switch, e.g.:
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    <div class='sourceblocktext'><div class="shell"><span style="font-weight:bold;">prism -settings ~/.prism</span><br/>
  </div></div>
    <div class='sourceblocklink'><a href='http://prismmodelchecker.localhost/manual/ConfiguringPRISM/Introduction?action=sourceblock&amp;num=3' type='text/plain'>[&#036;[Get Code]]</a></div>
  </div>
  
  <p class='vspace'>In the following sections, we give a brief description of the most important configuration options available.
  </p>
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  <h3><a class='wikilink' href='../Main/Main.html'>PRISM Manual</a></h3>
  <p><strong><a class='wikilink' href='Main.html'>Configuring PRISM</a></strong>
  </p><ul><li><a class='selflink' href='Main.html'>Introduction</a>
  </li><li><a class='wikilink' href='ComputationEngines.html'>Computation Engines</a>
  </li><li><a class='wikilink' href='SolutionMethodsAndOptions.html'>Solution Methods And Options</a>
  </li><li><a class='wikilink' href='IterativeNumericalMethods.html'>Iterative Numerical Methods</a>
  </li><li><a class='wikilink' href='AutomataGeneration.html'>Automata Generation</a>
  </li><li><a class='wikilink' href='OtherOptions.html'>Other Options</a>
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