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\author{Piyush P Kurur\\
  Office no: 224\\
  Dept. of Comp. Sci. and Engg.\\
  IIT Kanpur}


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\title{Fundamentals of Computing: Lecture 39}
\date{November 13, 2009}
\begin{document}
\begin{frame}
  \maketitle
\end{frame}

\begin{frame}
  
  \frametitle{Conditionals statement}
  \pause
  \begin{multicols}{2}
  \begin{tabbing}\tt
~~~~~if~cmd\\
\tt ~~~~~then\\
\tt ~~~~~~~~~cmd\\
\tt ~~~~~fi
\end{tabbing}
  \pause
  \newpage
  \begin{tabbing}\tt
~~~~~if~cmd\\
\tt ~~~~~then\\
\tt ~~~~~~~~cmd\\
\tt ~~~~~else\\
\tt ~~~~~~~~cmd\\
\tt ~~~~~fi
\end{tabbing}
  \end{multicols}
\end{frame}
\begin{frame}
  \frametitle{Loop statements}
  \pause
  \begin{tabbing}\tt
~~~~~while~cmd\\
\tt ~~~~~do\\
\tt ~~~~~~~~cmd\\
\tt ~~~~~done
\end{tabbing}
  \pause
  \begin{tabbing}\tt
~~~~~for~i~in~\char42{}\\
\tt ~~~~~do\\
\tt ~~~~~~~~~echo~The~value~of~\char39{}\char36{}i\char39{}~is~\char34{}\char36{}i\char34{}\\
\tt ~~~~~done
\end{tabbing}
 
\end{frame}

\end{document}
\begin{frame}
  \frametitle{Philosophy of shell programming} 

  There any many small but efficient programs.  Combine them.
  
  You need to know many of these common programs.
  
  \begin{itemize}
  \item \text{\tt echo} prints its command line arguments
    \pause
  \item \text{\tt less} shows int \text{\tt stdin} in pages
    \begin{tabbing}\tt
~~~~~~~\char36{}~cmd~\char124{}~less\\
\tt ~~~~~~~\char36{}~less~foo~bar~biz
\end{tabbing}
    \pause
  \item \text{\tt grep~pattern} shows only those lines of its stdin that
    matches the pattern.
  \end{itemize}
  \pause
  There are many more. 
  \pause
  To learn more, use command prompt always and read manpages.
\end{frame}
