\end{frame}
\subsection{Introductie variabelen, speciale variabelen}
-\begin{frame}
+\begin{frame}[fragile]
\frametitle{Speciale variabelen}
\begin{block}{Intro variabelen}
-
+ \begin{lstlisting}[style=bashregel]
+ NAAM=frob
+ NAAM="frob nicator"
+ echo $frob
+ echo ${frob}
+ echo "$frob"
+ \end{lstlisting}
\end{block}
\begin{block}{Speciale variabelen}
+ \begin{lstlisting}[style=bashregel]
+ $?
+ $!
+ $@
+ $1
+ $2
+ ...
+ \end{lstlisting}
\end{block}
\end{frame}