%%
%% The LaTeX Companion, 3ed
%%
%% Example 4-2-9 on page I-303 in "upquote --- Computer program style quoting".
%%
%% Copyright (C) 2022 Frank Mittelbach
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3c
%% of this license or (at your option) any later version.
%%
%% See https://www.latex-project.org/lppl.txt for details.
%%

\documentclass{tlc3exa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{207.0pt}

  \setlength\parindent{0pt}

%StartShownPreambleCommands
\usepackage[scaled=.85]{luximono}
\usepackage{upquote}
%StopShownPreambleCommands

\begin{document}
\verb+TEST=`ls -l |awk '{print $3}'`+

\renewcommand\ttdefault{pcr}
\verb+TEST=`ls -l |awk '{print $3}'`+

\renewcommand\ttdefault{cmtt}
\verb+TEST=`ls -l |awk '{print $3}'`+ \\
\texttt{Notice that `text' is unaffected!}
\end{document}