\documentclass[9pt,letterpaper,twoside]{extreport}
\usepackage[utf8]{inputenc}
\usepackage[english]{babel}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{makeidx}
\usepackage{graphicx}
\usepackage{amsfonts}
\usepackage{lastpage}

% page size
\usepackage[
	paperheight=8.5in,
	paperwidth=5.5in,
	left=1cm,
	right=1cm,
	top=2cm,
	bottom=2cm]
	{geometry}

% fancy headers
\usepackage{fancyhdr}
\pagestyle{fancy}
 \fancyhf{}
 \fancyhead[RO]{\textit{A Linux Dictionary}}
 \fancyhead[LE]{1\textsuperscript{st} Edition}
 \cfoot{Page \thepage}
\renewcommand{\footrulewidth}{0.5pt}

% multicolumns
\usepackage{multicol}
\setlength{\columnsep}{0.25in}
\setlength{\columnseprule}{0.1pt}

% hanging indents; we need it for the bibliography
\usepackage{hanging}

% Use definition lists
\usepackage{enumitem}

% Do not insert space between items in list
% We will space between items when we create the definition list
\setlist{noitemsep}

% Use tab stops when we need to
\usepackage{tabto}

% Include sections and subsections in the TOC
% https://latex-tutorial.com/tutorials/table-of-contents/
\setcounter{tocdepth}{2}

% Turn off section numbering
% https://tex.stackexchange.com/questions/246571/table-of-contents-problem
% Necessary to create table of contents with unnumbered sections
\setcounter{secnumdepth}{0}

% Use a custom title for the TOC
% https://tex.stackexchange.com/questions/35903/formatting-the-title-of-the-toc
\AtBeginDocument{\renewcommand\contentsname{The Contents}}

% Center the TOC title
% https://ctan.math.utah.edu/ctan/tex-archive/macros/latex/contrib/tocloft/tocloft.pdf
% https://tex.stackexchange.com/questions/114709/how-do-i-get-the-table-of-contents-list-of-figures-and-list-of-tables-to-have-t
% See Werner's note about the variable 'Z'
\usepackage{tocloft}
\renewcommand{\cfttoctitlefont}{\hfill\Large\textbf}
\renewcommand{\cftaftertoctitle}{\hfill} 

% Change the space above and below the TOC title
% https://tex.stackexchange.com/questions/46724/remove-vertical-space-before-table-of-contents-title
\setlength{\cftbeforetoctitleskip}{-3em}
\setlength{\cftaftertoctitleskip}{1em}

% Tighten up the typography
\usepackage{microtype}
\raggedbottom

% Add URLS
\usepackage[hidelinks]{hyperref}

\author{Kenneth John Odle}

\begin{document}

\tableofcontents

\medskip

\begin{small}
Pages 1-40 are in volume 1. Pages 41-\pageref*{LastPage} are in volume 2.
\end{small}

\bigskip

\hrule
\begin{center}
\section{The Introduction}
\end{center}
\input{include/intro.tex}

\hrule
\begin{center}
\section{The Abbreviations}
\end{center}
\input{include/abbrev.tex}

\hrule
\begin{center}
\section{The Words}
\end{center}

\bigskip

% {\parskip=2pt % Add parskip if needed

% Begin listing
\begin{multicols}{2}
\begin{small}
\begin{description}[leftmargin=4mm,labelsep=3mm,itemindent=0mm,itemsep=1mm,style=nextline]


% First section : A-F
\begin{centering}
\subsection{alias -- fsck}
\end{centering}
\input{include/1.tex}

% Second section : G-M
\medskip
\hrule
\begin{centering}
\subsection{gedit - mv}
\end{centering}
\input{include/2.tex}

% Third section : N-S
\medskip
\hrule
\begin{centering}
\subsection{nano -- sys}
\end{centering}
\input{include/3.tex}

% Fourth section : T-Z
\medskip
\hrule
\begin{centering}
\subsection{tail -- zip}
\end{centering}
\input{include/4.tex}

% End listings
\end{description}
\end{small}
\end{multicols}

\hrule

\begin{center}
\section{The Sources}
\end{center}
\input{include/sources}

\end{document}