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If you're on a unix-like system, the following command will find all lines with non-ASCII characters in one or more files:</div>
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LC_ALL=utf8 egrep -n '[^ -~]' file.tex</div>
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-- Peter</div>
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<div id="divRplyFwdMsg" dir="ltr"><span style="font-family: Calibri, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);"><b>From:</b> pdftex <pdftex-bounces+selinger=mathstat.dal.ca@tug.org> on behalf of David Carlisle via pdftex <pdftex@tug.org><br>
<b>Sent:</b> April 21, 2024 4:01 PM<br>
<b>To:</b> pdftex@tug.org <pdftex@tug.org><br>
<b>Subject:</b> Re: [pdftex] foreign letter in text</span>
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On 21/04/2024 19:53, Aleks Kleyn wrote:<br>
><br>
> When I prepare text in English, I usually write it on Russian and then<br>
> translate it into English. But sometimes these operations for different<br>
> reason are separated in time. Initially pdflatex printed in log which are<br>
> not English. It was helpful to locate such letters and finish text. Now<br>
> pdflatex prints some blank symbol instead of foreign letter. And how I can<br>
> locate now foreign letter in text that has about 20 files?<br>
><br>
> Aleks Kleyn<br>
><br>
><br>
As you provided no example it is hard to know what you have done but you<br>
should never get no output with no warning.<br>
<br>
<br>
For example this document with (I hope:-) one Russian word left in an<br>
English paragraph<br>
<br>
<br>
<br>
\documentclass{article}<br>
<br>
\begin{document}<br>
<br>
Some English with a Русский word<br>
<br>
\end{document}<br>
<br>
<br>
Produces the error<br>
<br>
<br>
! LaTeX Error: Unicode character Р (U+0420)<br>
not set up for use with LaTeX.<br>
<br>
See the LaTeX manual or LaTeX Companion for explanation.<br>
Type H <return> for immediate help.<br>
...<br>
<br>
l.5 Some English with a Р<br>
усский word<br>
?<br>
<br>
<br>
Which as you see, higlights the exact location of the Cyrillic text.<br>
<br>
<br>
David<br>
<br>
<br>
<br>
<br>
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