\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{Suha}
\pdfinfo{
  /Title (perl-basics-cheatsheet.pdf)
  /Creator (Cheatography)
  /Author (Suha)
  /Subject (Perl Basics Cheatsheet 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}{A3A3A3}
\definecolor{LightBackground}{HTML}{F3F3F3}
\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{Perl Basics Cheatsheet Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{Suha} via \textcolor{DarkBackground}{\uline{cheatography.com/24686/cs/6510/}}}
\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}Suha \\
  \uline{cheatography.com/suha} \\
  \end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Published 29th December, 2015.\\
   Updated 11th May, 2016.\\
   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{tabularx}{17.67cm}{x{4.2175 cm} x{6.2419 cm} x{6.4106 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{3}{x{17.67cm}}{\bf\textcolor{white}{Functions}}  \tn
% Row 0
\SetRowColor{LightBackground}
{\bf{Arrays}} & push @arr, \$x & Add to end of array \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
 & \$x = pop @arr; & Remove last element of array, put in \$x \tn 
% Row Count 5 (+ 3)
% Row 2
\SetRowColor{LightBackground}
 & shift @arr; (See also unshift) & Remove first element of an arrray, put in \$x \tn 
% Row Count 8 (+ 3)
% Row 3
\SetRowColor{white}
 & \$size = scalar @arr; & Number of things in the array \tn 
% Row Count 10 (+ 2)
% Row 4
\SetRowColor{LightBackground}
 & See also: split, join, splice, sort & split string-\textgreater{}array, join array-\textgreater{}string, delete part of array, sort array in many ways \tn 
% Row Count 16 (+ 6)
% Row 5
\SetRowColor{white}
{\bf{scalar variables}} & while (defined (\$x=\textless{}\textgreater{})) \{code\} & False if variable has never been set (or when you try to read past the end of an input file) \tn 
% Row Count 23 (+ 7)
% Row 6
\SetRowColor{LightBackground}
 & length(\$x) & Length of a string \tn 
% Row Count 25 (+ 2)
% Row 7
\SetRowColor{white}
 & chomp(\$line); & Remove a newline at the end of a string \tn 
% Row Count 28 (+ 3)
% Row 8
\SetRowColor{LightBackground}
 & \seqsplit{\$short=substr} (\$long, 2, 5) & Characters 3-7 of \$long (first char is 0!) \tn 
% Row Count 31 (+ 3)
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{17.67cm}{x{4.2175 cm} x{6.2419 cm} x{6.4106 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{3}{x{17.67cm}}{\bf\textcolor{white}{Functions (cont)}}  \tn
% Row 9
\SetRowColor{LightBackground}
{\bf{Hashes}} & @key = keys \%hash & The lookup terms in the hash \tn 
% Row Count 2 (+ 2)
% Row 10
\SetRowColor{white}
 & if (exists \$hh\{"Hsp"\}) \{...\} & See whether hash \%hh has a value for key Hsp \tn 
% Row Count 5 (+ 3)
% Row 11
\SetRowColor{LightBackground}
{\bf{Input/Output and Files}} & open(HANDLE, "\textgreater{}outfile") or die "Can't open \$outfile: \$!\textbackslash{}n" & Open outfile for writing, and associate it with filehandle HANDLE. Use " \tn 
% Row Count 10 (+ 5)
% Row 12
\SetRowColor{white}
 & print \$x; print HANDLE \$x; & Prints to standard output (screen), Print to filehandle HANDLE \tn 
% Row Count 15 (+ 5)
% Row 13
\SetRowColor{LightBackground}
 & warn "Something wrong\textbackslash{}n"; & Prints to standard error (screen) \tn 
% Row Count 18 (+ 3)
% Row 14
\SetRowColor{white}
 & \$x=\textless{}HANDLE\textgreater{} & Read a line from filehandle HANDLE, put in \$x \tn 
% Row Count 21 (+ 3)
% Row 15
\SetRowColor{LightBackground}
 & \seqsplit{close(HANDLE);} & Stop \seqsplit{reading/writing} a previously opened file \tn 
% Row Count 24 (+ 3)
% Row 16
\SetRowColor{white}
{\bf{Exit}} & exit; & Exits the program \tn 
% Row Count 26 (+ 2)
% Row 17
\SetRowColor{LightBackground}
 & die "Something broke!\textbackslash{}n"; & exits the program with error message \tn 
% Row Count 29 (+ 3)
% Row 18
\SetRowColor{white}
\mymulticolumn{3}{x{17.67cm}}{\textgreater{}\textgreater{} Operators and Loops} \tn 
% Row Count 30 (+ 1)
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{17.67cm}{x{4.2175 cm} x{6.2419 cm} x{6.4106 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{3}{x{17.67cm}}{\bf\textcolor{white}{Functions (cont)}}  \tn
% Row 19
\SetRowColor{LightBackground}
\mymulticolumn{3}{x{17.67cm}}{\textgreater{}\textgreater{} Matching and Regular Expressions} \tn 
% Row Count 1 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}---}
\SetRowColor{LightBackground}
\mymulticolumn{3}{x{17.67cm}}{Source :\{\{link="http://www.greycampus.com"\}\}GreyCampus\{\{/link\}\} \newline Training \& Certification in Perl :\{\{link="http://http://www.greycampus.com/perl-training-instructor-led"\}\}Perl Certification\{\{/link\}\}}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}---}
\end{tabularx}
\par\addvspace{1.3em}



\end{document}