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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Using Linux Tools
%
% Author: FOSSEE
% Copyright (c) 2009, FOSSEE, IIT Bombay
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% Taken from Fernando's slides.
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\author[FOSSEE]{}
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\date[]{}
% \setbeamercovered{transparent}
% theme split
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\usepackage{mathpazo,courier,euler}
\usepackage{listings}
\lstset{language=sh,
basicstyle=\ttfamily\bfseries,
showstringspaces=false,
keywordstyle=\color{black}\bfseries}
% logo
\logo{\includegraphics[height=1.30 cm]{../images/3t-logo.pdf}}
\logo{\includegraphics[height=1.30 cm]{../images/fossee-logo.pdf}
\hspace{7.5cm}
\includegraphics[scale=0.99]{../images/fossee-logo.pdf}\\
\hspace{281pt}
\includegraphics[scale=0.80]{../images/3t-logo.pdf}}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% DOCUMENT STARTS
\begin{document}
\sffamily \bfseries
\title
[Control structures and Operators]
{Control structures and Operators}
\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}} \\ [0.8cm]
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 scripts using `Control Operators'
\item Use Environment Variables
\end{itemize}
\end{frame}
\begin{frame}
\frametitle{Pre-requisites}
\label{sec-3}
Spoken tutorial on -
\begin{itemize}
\item Shell scripts \& Variables
\end{itemize}
\end{frame}
\begin{frame}[fragile]
\frametitle{\texttt{if}}
\begin{itemize}
\item Print message if directory exists in \texttt{pwd}
\end{itemize}
\begin{lstlisting}
#!/bin/bash
if test -d $1
then
echo "Yes, the directory" $1
"is present"
fi
\end{lstlisting} % $
\end{frame}
\begin{frame}[fragile]
\frametitle{\texttt{[ ]} - alias for \texttt{test}}
\begin{itemize}
\item Square brackets (\texttt{[]}) instead of \texttt{test}
\end{itemize}
\begin{lstlisting}
#!/bin/bash
if [ $1 -lt 0 ]
then
echo "number is negative"
else
echo "number is non-negative"
fi
\end{lstlisting} % $
\end{frame}
\begin{frame}[fragile]
\frametitle{Exercise}
\begin{itemize}
\item Given a set of \texttt{.mp3} files, with names beginning with numbers
followed by text -- eg: \texttt{08 - Society.mp3}
\begin{itemize}
\item Rename the files to have just the names
\item Replace any spaces in the name with hyphens
\end{itemize}
\end{itemize}
\end{frame}
% \begin{itemize}
% \item Loop over the list of files
% \item Process the names, to get new names
% \item Rename the files
% \end{itemize}
%\end{frame}
\begin{frame}[fragile]
\frametitle{Shell Variables vs. Environment variables}
%\texttt{Environment variables vs. Shell variables}
\begin{table}
\begin{tabular}{|l|l|}
\hline
Shell var. & Environment var.\\\hline
only current instance & valid for the whole\\
of the shell & whole session\\\hline
UPPER CASE & lower case\\\hline
\end{tabular}
\end{table}
\end{frame}
\begin{frame}
\frametitle{Summary}
\label{sec-8}
In this tutorial, we have learnt to,
\begin{itemize}
\item Prepare scripts using control structures -- ``if'', ``if-else'',
``for'' \& ``while''
\item Use environment variables
\item Export variable to environment of all processes, using
``export'' command
\end{itemize}
\end{frame}
\begin{frame}[fragile]
\frametitle{Evaluation}
\label{sec-9}
\begin{enumerate}
\item Print the text ``dog man'' in such a way that the prompt continues after
the text.
\vspace{8pt}
\item How can you add a new path variable ``\texttt{/myscripts}'' to \$PATH variable ?
\end{enumerate}
\end{frame}
\begin{frame}
\frametitle{Solutions}
\label{sec-10}
\begin{enumerate}
\item \$ echo -n dog man
\vspace{15pt}
\item \$export PATH=\$PATH://myscripts
\end{enumerate}
\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}
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