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% Author: FOSSEE 
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\begin{document}

\sffamily \bfseries
\title
[Shell scripts \& Variables]
{Shell scripts \& Variables}
\author
[FOSSEE]
{\small Talk to a Teacher\\{\color{blue}\url{http://spoken-tutorial.org}}\\\vspace{0.25cm}National Mission on Education
 through ICT\\{\color{blue}\url{ http://sakshat.ac.in}} \\ [1.65cm]
   Contributed by FOSSEE Team \\IIT Bombay  \\[0.3cm]
}

% slide 1
\begin{frame}
   \titlepage
\end{frame}

\begin{frame}
\frametitle{Objectives}
\label{sec-2}

At the end of this tutorial, you will be able to,
\begin{itemize}
\item Prepare a simple shell script. 
\item Run a script successfully and print it's result.
\item Understand what an environment variable is.
\end{itemize}
\end{frame}

\begin{frame}
\frametitle{Pre-requisites}
\label{sec-3}

Spoken tutorial on,
\begin{itemize}
\item Getting started with Linux
\item Basic file handling
\item Redirection and Piping
\item Text Processing
\end{itemize}
\end{frame}

\begin{frame}[fragile]
  \frametitle{\texttt{PATH}}
  \begin{itemize}
  \item Shell searches in a set of locations 
  \item Locations are saved in ``environment'' variable called PATH
  \end{itemize}
  \hspace{30pt}\texttt{\$ echo \$PATH}
  %\hspace{26pt}  \verb~$ echo $PATH~
  \begin{itemize}
  \item Put results.sh in 1 of these locations
  \item It can then be run without \texttt{./} 
  \end{itemize}
\end{frame}

\begin{frame}[fragile]
  \frametitle{Variables \& Comments}
  \verb~$ name=FOSSEE~
  \verb~$ count=`wc -l wonderland.txt`~
  \verb~$ echo $count # Shows the value~
  \verb~of count~
  \begin{itemize}
  \item \alert{NOTE:} No space around the \texttt{=} sign
  \item All text following the \texttt{\#} is considered a comment
  \end{itemize}
\end{frame}

\begin{frame}
\frametitle{Summary}
\label{sec-8}

  In this tutorial, we have learnt to,


\begin{itemize}
\item Prepare a shell script.
\item Display the result of a script, using the ``echo'' command.
\item Use the environment variable ``PATH''.
\item Create variables and comment out content using the ``\#'' sign.
\end{itemize}
\end{frame}

\begin{frame}[fragile]
\frametitle{Evaluation}
\label{sec-9}


\begin{enumerate}
\item Which sign is used to comment out content from a shell script?\\
%\begin{itemize}
{\color{LimeGreen}$\bullet$} \$ \hspace{80pt}{\color{LimeGreen}$\bullet$} \% \\
{\color{LimeGreen}$\bullet$} \# \hspace{80pt}{\color{LimeGreen}$\bullet$} * \\
\vspace{8pt}
\item How will you add directory ``/data/scripts'' to the beginning of 
    the \$PATH environment variable ?
\end{enumerate}
\end{frame}

%\begin{frame}[fragile]
%\frametitle{Evaluation}
%\label{sec-9}


%\begin{enumerate}
%\item Which sign is used to comment out content from a shell script?
%\begin{itemize}
%\item \$ 
%\item \%
%\item \#
%\item *
%\end{itemize}
%\vspace{8pt}
%\item How will you add directory ``/data/myscripts'' to the beginning of 
%    the \$PATH environment variable ?
%\end{enumerate}
%\end{frame}

\begin{frame}
\frametitle{Solutions}
\label{sec-10}


\begin{enumerate}
\item `` \# ''
\vspace{15pt}
\item \texttt{\$ PATH=/data/scripts:\$PATH}
\end{enumerate}
\end{frame}

\begin{frame}
\frametitle{SDES \& FOSSEE}
\begin{center}
\begin{itemize}
\item \small{SDES}\\
\small{\color{LimeGreen}Software Development techniques for Engineers and Scientists} \\
\scriptsize An initiative by FOSSEE. \\
\vspace{3pt}
\scriptsize For more information on SDES, please visit {\color{blue}\url{http://fossee.in/sdes}}\\
\vspace{10pt}
\item \small{FOSSEE}\\
\small {\color{LimeGreen}Free and Open-source Software for \\Science and Engineering Education} \\
\scriptsize Based at IIT Bombay, Funded by MHRD.\\
\vspace{3pt}
\scriptsize Part of National Mission on Education through ICT \\(NME-ICT) \\
\end{itemize}
\end{center}
\end{frame}

\begin{frame}
\frametitle{About the Spoken Tutorial Project}
\begin{itemize}
\item Watch the video available at {\color{blue}\url{http://spoken-tutorial.org /What\_is\_a\_Spoken\_Tutorial}} 
\item It summarises the Spoken Tutorial project 
\item If you do not have good bandwidth, you can download and watch it
\end{itemize}
\end{frame}

\begin{frame}
\frametitle{Spoken Tutorial Workshops}The Spoken Tutorial Project Team 
\begin{itemize}
\item Conducts workshops using spoken tutorials 
\item Gives certificates to those who pass an online test 
\item For more details, please write to \\ \hspace {0.5cm}{\color{blue}contact@spoken-tutorial.org}
\end{itemize}
\end{frame}

\begin{frame}
\frametitle{Acknowledgements}
\begin{itemize}
\item Spoken Tutorial Project is a part of the Talk to a Teacher  project 
\item It is supported by the National Mission on Education through  ICT, MHRD, Government of India 
\item More information on this Mission is available at: \\{\color{blue}\url{http://spoken-tutorial.org/NMEICT-Intro}}
\end{itemize}
\end{frame}

\begin{frame}

  \begin{block}{}
  \begin{center}
  {\Large THANK YOU!} 
  \end{center}
  \end{block}
\begin{block}{}
  \begin{center}
    For more Information, visit our website\\
    {\color{blue}\url{http://fossee.in/}}
  \end{center}  
  \end{block}
\end{frame}


\end{document}