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% Document Info
\author{Nouha\_Thabet}
\pdfinfo{
  /Title (awk-part-1.pdf)
  /Creator (Cheatography)
  /Author (Nouha\_Thabet)
  /Subject (AWK - Part 1 Cheat Sheet)
}

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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}}
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\columnbreak
\begin{tabulary}{11cm}{L}
    \vspace{-2pt}\large{\bf{\textcolor{DarkBackground}{\textrm{AWK - Part 1 Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{Nouha\_Thabet} via \textcolor{DarkBackground}{\uline{cheatography.com/103894/cs/21374/}}}
\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}Nouha\_Thabet \\
  \uline{cheatography.com/nouha-thabet} \\
  \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 12th December, 2019.\\
   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}
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\begin{multicols*}{3}

\begin{tabularx}{5.377cm}{p{0.4977 cm} p{0.4977 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{AWK - Origin}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{The name AWK comes from the last initials of its creators Alfred V. Aho, Peter J. Weinberger, and Brian W. Kernighan.} \tn 
% Row Count 3 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{p{0.4977 cm} p{0.4977 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Where AWK is available ?}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{AWK is preinstalled in most UNIX variants. Just we need to type `awk` in the command line.} \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{On Windows we need to install "Cygwin" or "UnixUtils"to use AWK} \tn 
% Row Count 4 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{p{0.4977 cm} p{0.4977 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Why we use AWK ?}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{AWK is a domain-specific language designed for text processing and typically used as a data extraction and reporting tool. It is used for manipulating text files which are devided into records or lines, and each line is devided into fields. \{\{nl\}\} It doesn't require that every line have the same format. But if a file is more structured like spreadsheet or a database, then we can do many things with it.} \tn 
% Row Count 9 (+ 9)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{p{0.4977 cm} p{0.4977 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{AWK Operations}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{Find interesting records in a data file.} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{Print or save specific fields.} \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{Perform manipulations like swapping the order of fields or combining them into one field.} \tn 
% Row Count 4 (+ 2)
% Row 3
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{Sophisticated data operations like join.} \tn 
% Row Count 5 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{3.28482 cm} x{1.69218 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{AWK Versions}}  \tn
% Row 0
\SetRowColor{LightBackground}
{\bf{Name}} & {\bf{Release Year}} \tn 
% Row Count 2 (+ 2)
% Row 1
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Original awk & 1978 \tn 
% Row Count 3 (+ 1)
% Row 2
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One True Awk or nawk or BWK awk & 1985 \tn 
% Row Count 5 (+ 2)
% Row 3
\SetRowColor{white}
GNU awk or gawk & 1990 \tn 
% Row Count 6 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{p{0.4977 cm} p{0.4977 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{AWK "Hello World" Example}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{`awk 'BEGIN \{print "Hello world"\}' \{\{nl\}\} \textgreater{}\textgreater{}\textgreater{} Hello world`} \tn 
% Row Count 2 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{p{0.4977 cm} p{0.4977 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Print specific fields from a text file}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{Soppose a file "names.txt" containing the following lines :} \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{Albert Einstein \{\{nl\}\} Barak Obama \{\{nl\}\} Steve Jobs} \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{Each line is composed of two fields which are firstname and lastname. We want to print these fields in the opposite order : Lastname followed by Firstname.} \tn 
% Row Count 8 (+ 4)
% Row 3
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{`awk '\{print \$2, \$1\} names.txt' \{\{nl\}\} \textgreater{}\textgreater{}\textgreater{} Einstein Albert \{\{nl\}\} \textgreater{}\textgreater{}\textgreater{} Obama Barak \{\{nl\}\} \textgreater{}\textgreater{}\textgreater{} Jobs Steve`} \tn 
% Row Count 11 (+ 3)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{Suppose `N = number of fields per line` \{\{nl\}\} We get each field by `"\$n"` where `n in {[}1 .. N{]} \{\{nl\}\}` So, what if we rewrite the previous command without a comma ? Let's see an example.} \tn 
% Row Count 15 (+ 4)
% Row 5
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{`awk '\{print \$2 \$1\} names.txt' \{\{nl\}\} \textgreater{}\textgreater{}\textgreater{} EinsteinAlbert \{\{nl\}\} \textgreater{}\textgreater{}\textgreater{} ObamaBarak \{\{nl\}\} \textgreater{}\textgreater{}\textgreater{} JobsSteve`} \tn 
% Row Count 17 (+ 2)
% Row 6
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{What we got is a concatenation of the two fields.} \tn 
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\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{p{0.4977 cm} p{0.4977 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Print a comma between two fields (concatenation)}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{Let take names.txt as a file example and print a comma between the firstname and the lastname.} \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{`awk print\{\$1 "," \$2\} \{\{nl\}\} \textgreater{}\textgreater{}\textgreater{} Albert,Einstein \{\{nl\}\} \textgreater{}\textgreater{}\textgreater{} Barak,Obama \{\{nl\}\} \textgreater{}\textgreater{}\textgreater{} Steve,Jobs`} \tn 
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\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{p{0.4977 cm} p{0.4977 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Print full lines from a file}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{Let take the previous text file names.txt as an example:} \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{`awk '\{print \$0\}' names.txt \{\{nl\}\} \textgreater{}\textgreater{}\textgreater{} Albert Einstein \{\{nl\}\} \textgreater{}\textgreater{}\textgreater{} Barak Obama \{\{nl\}\} \textgreater{}\textgreater{}\textgreater{} Steve Jobs`} \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{Or we can also simply write the following  command:} \tn 
% Row Count 6 (+ 2)
% Row 3
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{`awk '\{print\}' names.txt \{\{nl\}\} \textgreater{}\textgreater{}\textgreater{} Albert Einstein \{\{nl\}\} \textgreater{}\textgreater{}\textgreater{} Barak Obama \{\{nl\}\} \textgreater{}\textgreater{}\textgreater{} Steve Jobs`} \tn 
% Row Count 8 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{p{0.4977 cm} p{0.4977 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Print each line with its number of fields}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{Let take the following file awk.txt:} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{AWK is awesome \{\{nl\}\} Let learn AWK together \{\{nl\}\} AWK is used for text processing} \tn 
% Row Count 3 (+ 2)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{We use NF to count and print the number of fields of each line.} \tn 
% Row Count 5 (+ 2)
% Row 3
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{`awk '\{print NF , \$0\}' awk.txt \{\{nl\}\} \textgreater{}\textgreater{}\textgreater{} 3 AWK is awesome \{\{nl\}\} \textgreater{}\textgreater{}\textgreater{} 4  Let learn AWK together \{\{nl\}\} \textgreater{}\textgreater{}\textgreater{} 6 AWK is used for text processing`} \tn 
% Row Count 8 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{p{0.4977 cm} p{0.4977 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Specify the number of field}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{We want to print Lines that contain exactly 6 fields in awk.txt, so we can use one of the following two commands:} \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{`awk NF == 6 '\{print \$0\}' \{\{nl\}\} \textgreater{}\textgreater{}\textgreater{} AWK is used for text processing \{\{nl\}\} awk 'NF ==6' \{\{nl\}\} \textgreater{}\textgreater{}\textgreater{} AWK is used for text processing`} \tn 
% Row Count 6 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}


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

\end{document}