\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{nhatlong0605}
\pdfinfo{
  /Title (lfcs-module1-essentialcommand.pdf)
  /Creator (Cheatography)
  /Author (nhatlong0605)
  /Subject (LFCS\_Module1\_EssentialCommand Cheat Sheet)
}

% Lengths and widths
\addtolength{\textwidth}{6cm}
\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}{4D4DA3}
\definecolor{LightBackground}{HTML}{F3F3F9}
\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{LFCS\_Module1\_EssentialCommand Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{nhatlong0605} via \textcolor{DarkBackground}{\uline{cheatography.com/68292/cs/17200/}}}
\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}nhatlong0605 \\
  \uline{cheatography.com/nhatlong0605} \\
  \end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Published 24th September, 2018.\\
   Updated 30th October, 2018.\\
   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*}{3}

\begin{tabularx}{5.377cm}{x{1.74195 cm} x{3.23505 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{MAN page}}  \tn
% Row 0
\SetRowColor{LightBackground}
man -a useradd & useradd command in all sections \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
man -k passwd | grep 8 & searching passwd keyword in man page from section 8 \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
man 8 useradd & showing useradd command from section 8 \tn 
% Row Count 6 (+ 2)
% Row 3
\SetRowColor{white}
man man & showing man command help \tn 
% Row Count 7 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{2.4885 cm} x{2.4885 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Hard links, soft links, finding files}}  \tn
% Row 0
\SetRowColor{LightBackground}
ln /etc/hosts myhosts & create hard links myhosts to /etc/hosts \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
ln -s /etc/hosts/ myhosts & create symbolic links myhosts \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
find /etc -name hosts & Find in /etc files with exact name "hosts" \tn 
% Row Count 7 (+ 3)
% Row 3
\SetRowColor{white}
find /etc -name "{\emph{hosts}}" & Find in /etc files with "hosts" in its name \tn 
% Row Count 10 (+ 3)
% Row 4
\SetRowColor{LightBackground}
find /etc -name "{\emph{hosts}}" -exec cp \{\} /etc/test/ \textbackslash{}; & Find in /etc file with "hosts" in name and copy it to /etc/test \tn 
% Row Count 14 (+ 4)
% Row 5
\SetRowColor{white}
find /etc -size +100K 2\textgreater{}/dev/null & File in /etc files over 100Kb and send error to /dev/null \tn 
% Row Count 17 (+ 3)
% Row 6
\SetRowColor{LightBackground}
grep student /etc/* 2\textgreater{}/dev/null & Find in /etc files with "student" in content \tn 
% Row Count 20 (+ 3)
% Row 7
\SetRowColor{white}
grep -l student /etc/* 2\textgreater{}/dev/null & List only the directories \tn 
% Row Count 22 (+ 2)
% Row 8
\SetRowColor{LightBackground}
find /etc -exec grep -l student \{\} \textbackslash{}; 2\textgreater{}/dev/null; cp \{\} /find/contents/ \textbackslash{}; 2\textgreater{}/dev/null & Find all directories and sub with files containing student in content and copy the result to /find/content \tn 
% Row Count 28 (+ 6)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{1.29402 cm} x{3.68298 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Administrative Tasks}}  \tn
% Row 0
\SetRowColor{LightBackground}
visudo & Edit {\emph{sudo}} configuration file \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
chvt t & Change virtual terminal 5 \tn 
% Row Count 3 (+ 1)
% Row 2
\SetRowColor{LightBackground}
\seqsplit{/etc/securetty} & Secure console file, delete 1 will no longer have access to that console \tn 
% Row Count 6 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{1.54287 cm} x{3.43413 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Input Output Redirection}}  \tn
% Row 0
\SetRowColor{LightBackground}
\textgreater{} & overwrite \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\textless{} & send into command \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
\textgreater{}\textgreater{} & append \tn 
% Row Count 3 (+ 1)
% Row 3
\SetRowColor{white}
\textless{}\textless{} & append into command or file \tn 
% Row Count 4 (+ 1)
% Row 4
\SetRowColor{LightBackground}
2\textgreater{} /dev/null & redirect error to null file \tn 
% Row Count 5 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{2.4885 cm} x{2.4885 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Text Processing Utilities}}  \tn
% Row 0
\SetRowColor{LightBackground}
cut -d : -f 3 /etc/passwd & Display third column using ":" delimiter in /etc/passwd \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
cut -d : -f 1 /etc/passwd | sort | tr {[}:lowercase:{]} {[}:uppercase:{]} & Display all username in /etc/passwd and translate all lowercase to uppercase \tn 
% Row Count 7 (+ 4)
% Row 2
\SetRowColor{LightBackground}
awk -F : ' \{ print \$1 \} ' /etc/passwd & Display first column using ":" field delimiter (-F) \tn 
% Row Count 10 (+ 3)
% Row 3
\SetRowColor{white}
sed -i -e '10d' grepfile1 & Delete (10d) interactively (-i) using edit option(-e) the tenth line \tn 
% Row Count 14 (+ 4)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{2.63781 cm} x{2.33919 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Archive, Backup, Compress, Uncompress}}  \tn
% Row 0
\SetRowColor{LightBackground}
tar cvf name.tar /dir & Create name.tar file from /dir \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
tar -xvfz archive.tar.gzip -C /target/dir & Extract archive.tar.gzip to /tar/dir \tn 
% Row Count 4 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{1.89126 cm} x{3.08574 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Create, Delete, Copy, Move}}  \tn
% Row 0
\SetRowColor{LightBackground}
ls -al /etc & list all files (-a) with all info (-l) in /etc \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
ls -r & list sub-directories (-r) \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
cp -R /etc/hosts \textasciitilde{}/files/ & copy all (-R) in hosts to home/files/ \tn 
% Row Count 6 (+ 2)
% Row 3
\SetRowColor{white}
mkdir -p /etc/photos & make directory etc and sub-directory photos \tn 
% Row Count 8 (+ 2)
% Row 4
\SetRowColor{LightBackground}
mv /tmp/test \textasciitilde{} & move test to home directory \tn 
% Row Count 10 (+ 2)
% Row 5
\SetRowColor{white}
rm -rf & remove recursively and ignore non existent file \tn 
% Row Count 12 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{2.23965 cm} x{2.73735 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{head, tail,}}  \tn
% Row 0
\SetRowColor{LightBackground}
head -n 5 /etc/passwd & Display first 5 lines in /etc/passwd \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
tail -f {\bf{/var/log/messages}} & Display the recent system messages \tn 
% Row Count 4 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{p{0.4177 cm} x{1.87965 cm} p{0.4177 cm} x{1.46195 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{4}{x{5.377cm}}{\bf\textcolor{white}{Regular expressions}}  \tn
% Row 0
\SetRowColor{LightBackground}
{\emph{note}} & Use with sed, vim, awk, grep &  &  \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
\textasciicircum{} & Start of a string & \textasciicircum{}abc & abc, abcdef,abc123 \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
\$ & End of a string & abc\$ & abc,123abc,fdeabc \tn 
% Row Count 6 (+ 2)
% Row 3
\SetRowColor{white}
| & Alteration & 1|8 & 1,8 \tn 
% Row Count 7 (+ 1)
% Row 4
\SetRowColor{LightBackground}
\{...\} & Exact quanity & ab\{2\}c & abbc \tn 
% Row Count 9 (+ 2)
% Row 5
\SetRowColor{white}
{[}...{]} & Explicit set of character to match & a{[}bB{]}c & abc,aBc \tn 
% Row Count 11 (+ 2)
% Row 6
\SetRowColor{LightBackground}
* & Null or more of the preceding character & ab*c & ac,abc,abbbbc \tn 
% Row Count 14 (+ 3)
% Row 7
\SetRowColor{white}
(...) & Group of character & (123)\{3\} & 123123123 \tn 
% Row Count 16 (+ 2)
% Row 8
\SetRowColor{LightBackground}
+ & One or more of predceding character & ab+c & abc,abbbbc \tn 
% Row Count 18 (+ 2)
% Row 9
\SetRowColor{white}
? & Null or 1 of the preceding character & ab?c & abc, ac \tn 
% Row Count 20 (+ 2)
% Row 10
\SetRowColor{LightBackground}
. & Any single character &  &  \tn 
% Row Count 22 (+ 2)
% Row 11
\SetRowColor{white}
\textbackslash{}s & Whitespaces & .* & Zero or more of any character \tn 
% Row Count 25 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}----}
\end{tabularx}
\par\addvspace{1.3em}


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

\end{document}