\frametitle{Practice: Data Extraction}
\begin{block}{Challenge}
You have a CSV (\texttt{Name,Age,Score}) called \texttt{class.csv}.
\begin{enumerate}
\item Print only the names of students older than 20.
\item Calculate the total number of words in a text file.
\end{enumerate}
\end{block}
\begin{alertblock}<2->{Answers}
\begin{enumerate}[<+->]
\item \texttt{awk -F',' '\$2 > 20 \{print \$1\}' class.csv}
\item \texttt{awk '\{total +} NF\} END \{print total\}' file.txt=
\end{enumerate}
\end{alertblock}
