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!! +var+ +string+
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$lst_tit rename$lst_titend$type_both<br>
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  $(lst_syntax)rename $emph f$emphend</tt> <br>
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  $lst_mean Changes the reference to a file $emph f$emphend, such as a
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  graphics file reachable by direct http, into one with a different name using
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  the method <tt>!getfile</tt>.
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  <p>
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  This command is useful with exercises where important information is carried
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  by multimedia files (pictures, audios, movies). It can be used to hide the
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  name of the multimedia file that otherwise would give clues to the solution
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  of the problem.
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  <p>The renamed file must be located within the module, and the
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  filename $emph f$emphend should start with <tt>$$module_dir</tt>.
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  <p>
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  The command returns a string which is the new URL. The file is not
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  effectively copied or renamed on the server.