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% Packages
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\usepackage{multicol}           % Allows multicols in tables
\usepackage{tabularx}           % Intelligent column widths
\usepackage{tabulary}           % Used in header and footer
\usepackage{hhline}             % Border under tables
\usepackage{graphicx}           % For images
\usepackage{xcolor}             % For hex colours
%\usepackage[utf8x]{inputenc}    % For unicode character support
\usepackage[T1]{fontenc}        % Without this we get weird character replacements
\usepackage{colortbl}           % For coloured tables
\usepackage{setspace}           % For line height
\usepackage{lastpage}           % Needed for total page number
\usepackage{seqsplit}           % Splits long words.
%\usepackage{opensans}          % Can't make this work so far. Shame. Would be lovely.
\usepackage[normalem]{ulem}     % For underlining links
% Most of the following are not required for the majority
% of cheat sheets but are needed for some symbol support.
\usepackage{amsmath}            % Symbols
\usepackage{MnSymbol}           % Symbols
\usepackage{wasysym}            % Symbols
%\usepackage[english,german,french,spanish,italian]{babel}              % Languages

% Document Info
\author{fenix9158}
\pdfinfo{
  /Title (rhcsa-chapter-commands.pdf)
  /Creator (Cheatography)
  /Author (fenix9158)
  /Subject (RHCSA Chapter Commands Cheat Sheet)
}

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% This two commands together give roughly
% the right line height in the tables
\renewcommand{\arraystretch}{1.3}
\onehalfspacing

% Commands
\newcommand{\SetRowColor}[1]{\noalign{\gdef\RowColorName{#1}}\rowcolor{\RowColorName}} % Shortcut for row colour
\newcommand{\mymulticolumn}[3]{\multicolumn{#1}{>{\columncolor{\RowColorName}}#2}{#3}} % For coloured multi-cols
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\color{TextColor}

% Header and Footer
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\fancyhead{} % Set header to blank
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\fancyhead[L]{
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{C}
    \SetRowColor{DarkBackground}
    \vspace{-7pt}
    {\parbox{\dimexpr\textwidth-2\fboxsep\relax}{\noindent
        \hspace*{-6pt}\includegraphics[width=5.8cm]{/web/www.cheatography.com/public/images/cheatography_logo.pdf}}
    }
\end{tabulary}
\columnbreak
\begin{tabulary}{11cm}{L}
    \vspace{-2pt}\large{\bf{\textcolor{DarkBackground}{\textrm{RHCSA Chapter Commands Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{fenix9158} via \textcolor{DarkBackground}{\uline{cheatography.com/182055/cs/41251/}}}
\end{tabulary}
\end{multicols}}

\fancyfoot[L]{ \footnotesize
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{LL}
  \SetRowColor{FootBackground}
  \mymulticolumn{2}{p{5.377cm}}{\bf\textcolor{white}{Cheatographer}}  \\
  \vspace{-2pt}fenix9158 \\
  \uline{cheatography.com/fenix9158} \\
  \end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Not Yet Published.\\
   Updated 11th November, 2023.\\
   Page {\thepage} of \pageref{LastPage}.
\end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Sponsor}}  \\
  \SetRowColor{white}
  \vspace{-5pt}
  %\includegraphics[width=48px,height=48px]{dave.jpeg}
  Measure your website readability!\\
  www.readability-score.com
\end{tabulary}
\end{multicols}}




\begin{document}
\raggedright
\raggedcolumns

% Set font size to small. Switch to any value
% from this page to resize cheat sheet text:
% www.emerson.emory.edu/services/latex/latex_169.html
\footnotesize % Small font.

\begin{multicols*}{2}

\begin{tabularx}{8.4cm}{x{2.48 cm} x{5.52 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Definitions}}  \tn
% Row 0
\SetRowColor{LightBackground}
Systemd & System and service manager \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
Units & Resources managed by systemd \tn 
% Row Count 3 (+ 2)
% Row 2
\SetRowColor{LightBackground}
Mount & A mount unit specifies how a file system can be mounted on a specific directory. \tn 
% Row Count 6 (+ 3)
% Row 3
\SetRowColor{white}
Socket & A socket creates a method for applications to communicate with one another. This can be defined as a file or a port. \tn 
% Row Count 11 (+ 5)
% Row 4
\SetRowColor{LightBackground}
| -\textgreater{}ListenStream & TCP Port used by service listed in service file. \tn 
% Row Count 13 (+ 2)
% Row 5
\SetRowColor{white}
| -\textgreater{}ListenDatagram & UDP Port used by service listed in service file. \tn 
% Row Count 15 (+ 2)
% Row 6
\SetRowColor{LightBackground}
Target Unit & A simple definition of a target unit is "a group of units." Formerly comparable to run levels in previous iterations of RHEL. \tn 
% Row Count 20 (+ 5)
% Row 7
\SetRowColor{white}
Want & A symbolic link is known as a want, as it defines what the target wants to start when it is processed. \tn 
% Row Count 24 (+ 4)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{2.96 cm} x{5.04 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Unit File Location \& Precedence}}  \tn
% Row 0
\SetRowColor{LightBackground}
\seqsplit{/run/systemd/system} & Contains unit files that have automatically been generated. \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
\seqsplit{/etc/systemd/system} & Contains custom unit files. It may also contain include files that have been written by an administrator or generated by the systemctl edit command. \tn 
% Row Count 9 (+ 6)
% Row 2
\SetRowColor{LightBackground}
\seqsplit{/usr/lib/systemd/system} & Contains default unit files that have been installed from RPM packages. You should never edit these files directly. \tn 
% Row Count 14 (+ 5)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{4 cm} x{4 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Systemd Commands}}  \tn
% Row 0
\SetRowColor{LightBackground}
systemctl -t help & display a list of available units \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
systemctl list-dependencies {[}service{]} & display an overview of any existing dependencies. \tn 
% Row Count 5 (+ 3)
% Row 2
\SetRowColor{LightBackground}
systemctl list-dependencies {[}service{]} -{}-reverse & find out which units are dependents of this unit. \tn 
% Row Count 8 (+ 3)
% Row 3
\SetRowColor{white}
systemctl {[}enable/disable{]} & ensure that a unit is automatically started/disable while booting. \tn 
% Row Count 12 (+ 4)
% Row 4
\SetRowColor{LightBackground}
systemctl show & To figure out which options are available for a specific unit. \tn 
% Row Count 16 (+ 4)
% Row 5
\SetRowColor{white}
systemctl show {[}service{]} & Shows all Systemd options that can be configured in the {[}service{]}.service unit, including their current default values. \tn 
% Row Count 22 (+ 6)
% Row 6
\SetRowColor{LightBackground}
systemctl edit & creates a subdirectory in /etc/systemd/system for the service that you are editing with an override.conf file that will overwrite any existing settings in the service file in \seqsplit{/usr/lib/systemd/system} \tn 
% Row Count 32 (+ 10)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{2.64 cm} x{5.36 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Tips}}  \tn
% Row 0
\SetRowColor{LightBackground}
Systemd Text Editior & swap the default editor in /root/.bash\_profile file to include the following line: export \seqsplit{SYSTEMD\_EDITOR="/bin/vim"} \tn 
% Row Count 5 (+ 5)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}


% That's all folks
\end{multicols*}

\end{document}