\frametitle{Essential Navigation Commands}
\begin{block}{Why?}
How do you know where you are in a system with millions of files?
\end{block}
\begin{block}<2->{Commands}
\begin{center}
\begin{tabular}{ll}
Command & Description\\
\hline
\texttt{pwd} & Print working directory\\
\texttt{cd <dir>} & Change directory\\
\texttt{ls [dir]} & List directory contents\\
\texttt{ls -l} & Long format listing\\
\texttt{ls -a} & Show hidden files\\
\texttt{ls -lh} & Human-readable sizes\\
\end{tabular}
\end{center}
\end{block}
