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This allows you to do some special 0127 effects. 0128 </p> 0129 <a name="index-package_002c-hyperref-3"></a> 0130 <a name="index-hyperref-package-3"></a> 0131 0132 <p>For example, this file (which uses the <samp>hyperref</samp> package for 0133 hyperlinks) can produce two kinds of output, one for paper and one for a 0134 PDF. 0135 </p> 0136 <div class="example"> 0137 <pre class="example">\ifdefined\paperversion % in preamble 0138 \newcommand{\urlcolor}{black} 0139 \else 0140 \newcommand{\urlcolor}{blue} 0141 \fi 0142 \usepackage[colorlinks=true,urlcolor=\urlcolor]{hyperref} 0143 ... 0144 \href{https://www.ctan.org}{CTAN} % in body 0145 ... 0146 </pre></div> 0147 0148 <p>Compiling this document <samp>book.tex</samp> with the command line 0149 <code>pdflatex book</code> will give the ‘<samp>CTAN</samp>’ link in blue. But 0150 compiling it with <code>pdflatex "\def\paperversion{}\input book.tex"</code> 0151 has the link in black. (Note the use of double quotes to prevent 0152 interpretation of the symbols by the command line shell; your system may 0153 do this differently.) 0154 </p> 0155 <p>In a similar way, from the single file <samp>main.tex</samp> you can compile 0156 two different versions. 0157 </p> 0158 <div class="example"> 0159 <pre class="example">pdflatex -jobname=students "\def\student{}\input{main}" 0160 pdflatex -jobname=teachers "\def\teachers{}\input{main}" 0161 </pre></div> 0162 0163 <p>The <code>jobname</code> option is there because otherwise both files would be 0164 called <samp>main.pdf</samp> and the second would overwrite the first. 0165 </p> 0166 <p>A final example. This loads the package <samp>graphicx</samp> with the option 0167 <code>draft</code> 0168 </p> 0169 <div class="example"> 0170 <pre class="example">pdflatex -jobname=aa "\RequirePackage[draft]{graphicx}\input{aa.tex}" 0171 </pre></div> 0172 0173 <p>so the graphic files are read for their size information but not 0174 incorporated into the PDF. (The <code>jobname</code> option is there because 0175 otherwise the output file would be <samp>graphicx.pdf</samp>, as 0176 <code>\RequirePackage</code> does an <code>\input</code> of its own.) 0177 </p> 0178 0179 0180 0181 <hr/><div class='referenceinfo'> <a href='https://latexref.xyz/'> <i>Unofficial LaTeX2e reference manual</i></a></div> 0182 </body> 0183 </html>