%%
%% The LaTeX Companion, 3ed
%%
%% Example 5-4-5 on page I-400 in "fancyhdr --- Customizing page styles".
%%
%% 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{124.20126pt}
\setlength\textheight{58pt} % 4\baselineskip + \topskip
% for the book examples we shorten the vertical spaces
  \makeatletter
  \renewcommand\section{\@startsection{section}{1}{\z@}%
    {-1.25ex \@plus-1ex \@minus-.2ex}%
    {.5ex}%
    {\normalfont\large\bfseries}}
  \makeatother

  \addtolength\headsep{-12pt}  % shortened for the book
  \addtolength\footskip{-12pt} % shortened for the book
  \sloppy                      % as these examples are so small

%StartShownPreambleCommands
\usepackage{kantlipsum}
\usepackage{fancyhdr,lastpage}
\pagestyle{fancy}
\fancyhf{} % --- clear all fields
\fancyhead[RO,LE]{\leftmark}
\fancyfoot[C]{Page \thepage\ of
              \pageref{LastPage}}
%StopShownPreambleCommands

\begin{document}
\section{A test}
\kant[9]
\end{document}