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\newcommand*{\labTitle}{Quiz 5: Shell Programming}
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\begin{document}
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%% \bfseries
%% {\Large Operating Systems and Systems Integration \  Quick Quiz 3}
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\textbf{Do not refer to any printed material.\\  No talking or discussion is
allowed until the answer sheets are all collected.}
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\paragraph{Review:}


\begin{enumerate}
  \item It is necessary to quote the \emph{parentheses} `\texttt{(\ldots)}'
    in the following shell command because:
\begin{alltt}
$ \textbf{echo \bs(3 + 4\bs) \bs* 5}
\end{alltt}
  \begin{enumerate}
  \item The shell will try to start a subshell
  \item The \emph{precedence} will be wrong, i.e., addition will not
    be done \emph{before} multiplication
  \item The shell will cause a sementation fault
  \item The shell will terminate with a \emph{divide by zero}
    exception
  \item The shell will expand into a list of files otherwise
  \end{enumerate}
  
\item Which of the following will cause a shell variable \texttt{x} to
  be defined with the value 10?
  \begin{enumerate}
  \item
\begin{alltt}
$ \textbf{$x=10}
\end{alltt}
  \item
\begin{alltt}
$ \textbf{$x=$\{10\}}
\end{alltt}%$
  \item
\begin{alltt}
$ \textbf{$x = 10}
\end{alltt}
  \item
\begin{alltt}
$ \textbf{x = 10}
\end{alltt}%$
  \item
\begin{alltt}
$ \textbf{x=10}
\end{alltt}%$
  \end{enumerate}

\item A shell script \texttt{script.sh} is executed like this, and the
  output is shown:
\begin{alltt}
$ \textbf{script.sh 1 2 3 4 5 6}
parameters are 1 2 3
\end{alltt}%$
  The first line of the file \texttt{script.sh} is
  \texttt{\#!~/bin/sh} \ The second line could be:
  \begin{enumerate}
  \item
\begin{alltt}
$ \textbf{parameters are $1 $2 $3}
\end{alltt}
  \item
\begin{alltt}
$ \textbf{echo parameters are $0 $1 $2}
\end{alltt}
  \item
\begin{alltt}
$ \textbf{echo parameters are $# $1 $2}
\end{alltt}
  \item
\begin{alltt}
$ \textbf{echo parameters are $param1 $param2 $param3}
\end{alltt}
  \item
\begin{alltt}
$ \textbf{echo parameters are $1 $2 $3}
\end{alltt}
  \end{enumerate}


%% \item the directory \texttt{/proc} contains information that is:
%%   \begin{enumerate}
%%   \item dynamic information about the OS and hardware
%%   \item a type of relational database; SQL is always used to query it
%%   \item a list of network \textbf{proc}ters
%%   \item is unreadable except by the OS kernel
%%   \item contains entirely static data that is fixed when the computer
%%     boots 
%%   \end{enumerate}
\end{enumerate}

\vspace*{-5mm}

\paragraph{Preparation:}

\begin{enumerate}
\setcounter{enumi}{3}
\item In the shell, \texttt{while} loops:
  \begin{enumerate}
  \item are not supported; we use \texttt{for} loops instead
  \item used with the keywords \texttt{do}\ldots\,\texttt{done}
  \item used with the keywords \texttt{do}\ldots\,\texttt{elihw}
  \item used with braces, as in C and Java
  \item used with the keywords \texttt{do}\ldots\,\texttt{fi}
  \end{enumerate}

\item Functions in the shell:
  \begin{enumerate}
  \item are not \emph{actual} functions, but are separate shell
    scripts that are loaded at run time
  \item are not supported in version~2.x of Bash;
  \item are less useful that in other programming languages
  \item Cannot accept function parameters
  \item are not used as much as \emph{shell objects}
  \end{enumerate}
\end{enumerate}
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