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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Using Linux Tools
%
% Author: FOSSEE
% Copyright (c) 2009, FOSSEE, IIT Bombay
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\documentclass[12pt,compress]{beamer}
\mode<presentation>
{
\usetheme{Warsaw}
\useoutertheme{infolines}
\setbeamercovered{transparent}
}
\usepackage[english]{babel}
\usepackage[latin1]{inputenc}
%\usepackage{times}
\usepackage[T1]{fontenc}
% Taken from Fernando's slides.
\usepackage{ae,aecompl}
\usepackage{mathpazo,courier,euler}
\usepackage[scaled=.95]{helvet}
\definecolor{darkgreen}{rgb}{0,0.5,0}
\usepackage{listings}
\lstset{language=sh,
basicstyle=\ttfamily\bfseries,
commentstyle=\color{red}\itshape,
stringstyle=\color{darkgreen},
showstringspaces=false,
keywordstyle=\color{blue}\bfseries}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% DOCUMENT STARTS
\begin{document}
\begin{frame}
\begin{center}
\vspace{12pt}
\textcolor{blue}{\huge Using Linux Tools\\Part VII}
\end{center}
\vspace{18pt}
\begin{center}
\vspace{10pt}
\includegraphics[scale=0.95]{../images/fossee-logo.png}\\
\vspace{5pt}
\scriptsize Developed by FOSSEE Team, IIT-Bombay. \\
\scriptsize Funded by National Mission on Education through ICT\\
\scriptsize MHRD,Govt. of India\\
\includegraphics[scale=0.30]{../images/iitb-logo.png}\\
\end{center}
\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 Understand what 'Environment Variables' are.
\end{itemize}
\end{frame}
\begin{frame}
\frametitle{Pre-requisite}
\label{sec-3}
Spoken tutorial on -
\begin{itemize}
\item Using Linux tools -- Part I
\item Using Linux tools -- Part II
\item Using Linux tools -- Part III
\item Using Linux tools -- Part IV
\item Using Linux tools -- Part V
\item Using Linux tools -- Part VI
\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{[]}) can be used instead of
\texttt{test}
\item
\end{itemize}
\begin{lstlisting}
#!/bin/bash
if [ $1 -lt 0 ]
then
echo "number is negative"
else
echo "number is non-negative"
fi
\end{lstlisting} % $
\begin{itemize}
\item \alert{spacing is important, when using the square brackets}
\end{itemize}
\end{frame}
\begin{frame}[fragile]
\frametitle{\texttt{for}}
\begin{block}{Problem}
Given a set of \texttt{.mp3} files, that have names beginning with
numbers followed by their names --- \texttt{08 - Society.mp3} ---
rename the files to have just the names. Also replace any spaces
in the name with hyphens.
\end{block}
\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{Environment Variables}
\begin{itemize}
\item Pass information from shell to programs running in it
\item Behavior of programs can change based on values of variables
\item Environment variables vs. Shell variables
\item Shell variables -- only current instance of the shell
\item Environment variables -- valid for the whole session
\item Convention -- environment variables are UPPER CASE
\end{itemize}
\end{frame}
\begin{frame}
\frametitle{Summary}
\label{sec-8}
In this tutorial, we have learnt to,
\begin{itemize}
\item Prepare scripts using control structures like ``if'', ``if-else'',
``for'' and ``while''.
\item Use 'environment variables'.
\item Export a variable to the environment of all the processes, using
the ``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 ``/data/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://data/myscripts
\end{enumerate}
\end{frame}
\begin{frame}
\begin{block}{}
\begin{center}
\textcolor{blue}{\Large THANK YOU!}
\end{center}
\end{block}
\begin{block}{}
\begin{center}
For more Information, visit our website\\
\url{http://fossee.in/}
\end{center}
\end{block}
\end{frame}
\end{document}
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