\documentclass[10pt,a4paper]{article}

% Packages
\usepackage{fancyhdr}           % For header and footer
\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{fbottarelli}
\pdfinfo{
  /Title (linux-for-dba-1.pdf)
  /Creator (Cheatography)
  /Author (fbottarelli)
  /Subject (Linux for DBA - 1 Cheat Sheet)
}

% Lengths and widths
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\addtolength{\textheight}{-1cm}
\addtolength{\hoffset}{-3cm}
\addtolength{\voffset}{-2cm}
\setlength{\tabcolsep}{0.2cm} % Space between columns
\setlength{\headsep}{-12pt} % Reduce space between header and content
\setlength{\headheight}{85pt} % If less, LaTeX automatically increases it
\renewcommand{\footrulewidth}{0pt} % Remove footer line
\renewcommand{\headrulewidth}{0pt} % Remove header line
\renewcommand{\seqinsert}{\ifmmode\allowbreak\else\-\fi} % Hyphens in seqsplit
% 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
\newcolumntype{x}[1]{>{\raggedright}p{#1}} % New column types for ragged-right paragraph columns
\newcommand{\tn}{\tabularnewline} % Required as custom column type in use

% Font and Colours
\definecolor{HeadBackground}{HTML}{333333}
\definecolor{FootBackground}{HTML}{666666}
\definecolor{TextColor}{HTML}{333333}
\definecolor{DarkBackground}{HTML}{C43939}
\definecolor{LightBackground}{HTML}{FBF2F2}
\renewcommand{\familydefault}{\sfdefault}
\color{TextColor}

% Header and Footer
\pagestyle{fancy}
\fancyhead{} % Set header to blank
\fancyfoot{} % Set footer to blank
\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{Linux for DBA - 1 Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{fbottarelli} via \textcolor{DarkBackground}{\uline{cheatography.com/177260/cs/37008/}}}
\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}fbottarelli \\
  \uline{cheatography.com/fbottarelli} \\
  \end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Published 7th March, 2023.\\
   Updated 7th March, 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{3.12 cm} x{4.88 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Basic}}  \tn
% Row 0
\SetRowColor{LightBackground}
man \textless{}command name\textgreater{} & help about the command \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
\textless{}command A\textgreater{}  | \textless{}command B\textgreater{} & send output of A in input to B \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
\textless{}nomecomando\textgreater{} \& & execute in background \tn 
% Row Count 5 (+ 1)
% Row 3
\SetRowColor{white}
jobs & show all the background \tn 
% Row Count 6 (+ 1)
% Row 4
\SetRowColor{LightBackground}
nohub \textless{}comando\textgreater{} \textless{}filename\textgreater{} & launch and protect the process \tn 
% Row Count 8 (+ 2)
% Row 5
\SetRowColor{white}
w & show the session \tn 
% Row Count 9 (+ 1)
% Row 6
\SetRowColor{LightBackground}
fg \%1 & return to foreground \tn 
% Row Count 10 (+ 1)
% Row 7
\SetRowColor{white}
cat \textless{}filename\textgreater{} & print the content of file in the terminal \tn 
% Row Count 12 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{3.2 cm} x{4.8 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{File navigation and Basic Operations}}  \tn
% Row 0
\SetRowColor{LightBackground}
pwd & print working directory \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
cd \textless{}path\textgreater{} & change driectory to \textless{}path\textgreater{} cd \textasciitilde{} \tn 
% Row Count 3 (+ 2)
% Row 2
\SetRowColor{LightBackground}
ls -lrt & directory file list with details \tn 
% Row Count 5 (+ 2)
% Row 3
\SetRowColor{white}
touch & create a file \tn 
% Row Count 6 (+ 1)
% Row 4
\SetRowColor{LightBackground}
mv \textless{}path1+filename\textgreater{} \textless{}path2\textgreater{} & move the file in path1 to path2, it can used to rename file \tn 
% Row Count 9 (+ 3)
% Row 5
\SetRowColor{white}
cp \textless{}path1+filename\textgreater{} \textless{}path2\textgreater{} & copy, same as above \tn 
% Row Count 11 (+ 2)
% Row 6
\SetRowColor{LightBackground}
file \textless{}filename\textgreater{} & show the file-type \tn 
% Row Count 12 (+ 1)
% Row 7
\SetRowColor{white}
ls -lrt \textless{}filename\textgreater{} & details about the file \tn 
% Row Count 14 (+ 2)
% Row 8
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{8.4cm}}{stat \textless{}filename\textgreater{}} \tn 
% Row Count 15 (+ 1)
% Row 9
\SetRowColor{white}
tail -f & show last rows of the file and keep update (live mnonitoring) \tn 
% Row Count 18 (+ 3)
% Row 10
\SetRowColor{LightBackground}
vi \textless{}filname\textgreater{} & open the file with vi editor \tn 
% Row Count 20 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{4.72 cm} x{3.28 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{File Permission}}  \tn
% Row 0
\SetRowColor{LightBackground}
chmod \textless{}nmz\textgreater{} \textless{}filename\textgreater{} & update the file permission \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
chown \textless{}new owner username\textgreater{} \textless{}filename\textgreater{} & update file owner \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
umask & show default mask \tn 
% Row Count 6 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{4.08 cm} x{3.92 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Main Directories}}  \tn
% Row 0
\SetRowColor{LightBackground}
/etc & configuration files \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
/var/log & log files \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
/tmp & temp. files \tn 
% Row Count 3 (+ 1)
% Row 3
\SetRowColor{white}
/home/\textless{}user\textgreater{} & home directory \tn 
% Row Count 4 (+ 1)
% Row 4
\SetRowColor{LightBackground}
which \textless{}command name\textgreater{} & find an executable \tn 
% Row Count 5 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{4.24 cm} x{3.76 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{PC details and monitoring}}  \tn
% Row 0
\SetRowColor{LightBackground}
cat /proc/meminfo & ram info \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
cat /proc/cpuinfo & cpu info \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
lshw & other info about the PC \tn 
% Row Count 4 (+ 2)
% Row 3
\SetRowColor{white}
memstat 1 & real time of values \tn 
% Row Count 6 (+ 2)
% Row 4
\SetRowColor{LightBackground}
vmstat 1 & Virtual memory stat. \tn 
% Row Count 8 (+ 2)
% Row 5
\SetRowColor{white}
iostat 1 & IO metrics, realtime \tn 
% Row Count 10 (+ 2)
% Row 6
\SetRowColor{LightBackground}
iotop & similar to iostat \tn 
% Row Count 11 (+ 1)
% Row 7
\SetRowColor{white}
top or htop (if installed) & show resources \tn 
% Row Count 13 (+ 2)
% Row 8
\SetRowColor{LightBackground}
ipcs -m & processes shared memory \tn 
% Row Count 15 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{3.12 cm} x{4.88 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Processes}}  \tn
% Row 0
\SetRowColor{LightBackground}
ps -ef & show processes \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
ps aux & alternative version, useful for mem . info \tn 
% Row Count 3 (+ 2)
% Row 2
\SetRowColor{LightBackground}
top or htop (if installed) & show resources \tn 
% Row Count 5 (+ 2)
% Row 3
\SetRowColor{white}
ipcs -m & processes shared memory \tn 
% Row Count 6 (+ 1)
% Row 4
\SetRowColor{LightBackground}
kill \textless{}PID\textgreater{} & kill a process \tn 
% Row Count 7 (+ 1)
% Row 5
\SetRowColor{white}
lsof & tands for LiSt Open Files and shows open files and which process uses them \tn 
% Row Count 11 (+ 4)
% Row 6
\SetRowColor{LightBackground}
lsof -Pp \textless{}pid\textgreater{} & file list used by the process \textless{}pid\textgreater{} \tn 
% Row Count 13 (+ 2)
% Row 7
\SetRowColor{white}
lsof -Pp \textless{}pid\textgreater{} | grep log & search for the log related to \textless{}pid\textgreater{} \tn 
% Row Count 15 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{3.92 cm} x{4.08 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Environments}}  \tn
% Row 0
\SetRowColor{LightBackground}
env & display environments variables \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
\textless{}variable name\textgreater{} = \textless{}var. content\textgreater{} & set a shell variable \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
export \textless{}variable name\textgreater{} = \textless{}var. content\textgreater{} & create subshell with env variables \tn 
% Row Count 7 (+ 3)
% Row 3
\SetRowColor{white}
source \textless{}file name\textgreater{} & akes available the variable in the file for the current shell \tn 
% Row Count 11 (+ 4)
% Row 4
\SetRowColor{LightBackground}
echo \$\{\textless{}variable name\textgreater{}\} & display the variables content \tn 
% Row Count 13 (+ 2)
% Row 5
\SetRowColor{white}
export \textless{}variable name\textgreater{} & send the variable to the subshells \tn 
% Row Count 15 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}


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

\end{document}