%%
%% The LaTeX Companion, 3ed
%%
%% Example 4-3-7 on page I-338 in "lineno --- Numbering lines of text".
%%
%% 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}

  \addtolength\textwidth{-30pt}

  \usepackage{microtype} % improve h&j
%  \tolerance=4000

%StartShownPreambleCommands
\usepackage{lipsum}
\usepackage[right]{lineno} \linenumbers
%StopShownPreambleCommands

\begin{document}
\textbf{The option ``right'' changes the
  line number position.} \lipsum[1][1] \par
\renewcommand\linenumberfont
  {\normalfont\footnotesize\ttfamily}
\setlength\linenumbersep{20pt}
\textbf{Now we use a different font and a
  bigger separation.} \lipsum[6][1-2]  \par
\end{document}