\frametitle{History Examples}
\begin{block}{Using History}
\begin{verbatim}
# View last 20 commands
history 20

# Forgot sudo?
$ ls /var/root
ls: /var/root: Permission denied
$ sudo !!

# Search history
(Press Ctrl+R, then type 'ssh')
(reverse-i-search)`ssh': ssh user@umd.edu
\end{verbatim}
\end{block}
