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For instance, 0124 running LaTeX on this file 0125 </p> 0126 <div class="example"> 0127 <pre class="example">\newcommand{\NP}{\ensuremath{\textbf{NP}}} 0128 The \PN{} problem is a million dollar one. 0129 </pre></div> 0130 0131 <p>causes it show this, and wait for input. 0132 </p> 0133 <div class="example"> 0134 <pre class="example">! Undefined control sequence. 0135 l.5 The \PN 0136 {} problem is a million dollar one. 0137 ? 0138 </pre></div> 0139 0140 <p>The simplest thing is to enter ‘<samp>x</samp>’ and <code><return></code> and fix the 0141 typo. You could instead enter ‘<samp>?</samp>’ and <code><return></code> to see other 0142 options. 0143 </p> 0144 <a name="index-_002a-prompt"></a> 0145 <a name="index-prompt_002c-_002a"></a> 0146 <a name="index-_005cstop"></a> 0147 <p>There are two other error scenarios. The first is that you forgot to 0148 include the <code>\end{document}</code> or misspelled it. In this case 0149 LaTeX gives you a ‘<samp>*</samp>’ prompt. You can get back to the command 0150 line by typing <code>\stop</code> and <code><return></code>. 0151 </p> 0152 <p>The last scenario is that you mistyped the file name. For instance, 0153 instead of <code>pdflatex test</code> you might type <code>pdflatex tste</code>. 0154 </p> 0155 <div class="example"> 0156 <pre class="example">! I can't find file `tste'. 0157 <*> tste 0158 0159 (Press Enter to retry, or Control-D to exit) 0160 Please type another input file name: 0161 </pre></div> 0162 0163 <p>The simplest thing is to enter <code><Control></code> and ‘<samp>d</samp>’ (holding 0164 them down at the same time), and then retype the correct command line. 0165 </p> 0166 0167 0168 0169 <hr/><div class='referenceinfo'> <a href='https://latexref.xyz/'> <i>Unofficial LaTeX2e reference manual</i></a></div> 0170 </body> 0171 </html>