\input{gl2.slide-header-beamer}
\errorcontextlines=99
%% Subtopic Number = '1.108.5'
%% Title from filename: 'Notify users on system-related issues'
%% Weight: 1
%% Description:
%% Candidates should be able to notify the users about current
%%        issues related to the system. This objective includes automating the
%%        communication process, e.g. through logon messages.
%% Key files, terms, and utilities include:
%%        /etc/issue
%%        /etc/issue.net
%%        /etc/motd
\title{1.108.5\\Notify users on system-related issues\\Weight 1}
\author[Geoff Robertson]{Geoffrey Robertson \texttt{ge@ffrey.com} \and
  Nick Urbanik
  \texttt{nicku@nicku.org}\\
  {\tiny This document Licensed under GPL---see
    section~\ref{sec:license}}}%
\subtitle{Linux Professional Institute Certification --- 102}%
\mode<article>{\chead{1.108.5}}%


\begin{document}
\maketitle
\mode<article>{\thispagestyle{empty}}

\section{Context}
\label{sec:context}


\begin{frame}
  \frametitle{Outline}
  \mode<presentation>
  {%
    %\footnotesize
    \begin{multicols}{2}
      \tableofcontents
    \end{multicols}
    % You might wish to add the option [pausesections]
  }%
  \mode<article>
  {%
    \tableofcontents
  }%
\end{frame}

\begin{frame}
  \frametitle{Topic 108 Documentation [8]}%
  \framesubtitle{Where we are up to}%
  \begin{description}
  \item[1.108.1] Use and Manage Local System Documentation [4]
  \item[1.108.2] Find Linux Documentation on the Internet [3]
    % \uline depends on \usepackage[normalem]{ulem}:
  \item[1.108.5] \textbf{\uline{Notify Users on System Related Issues [1]}}
  \end{description} 
\end{frame}
%-----------------------------------------------------------
 
\section{Objective}
\label{sec:objective}


\begin{frame}
  \frametitle{Description of Objective}%
  \framesubtitle{1.108.5\ \ Notify users on system-related issues}%
  \mode<presentation>{\Large}%
  Candidates should be able to notify the users about current issues
  related to the system. This objective includes automating the
  communication process, e.g. through logon messages.
\end{frame}

\begin{frame}[fragile]
  \frametitle{Key files, terms, and utilities include:}
  \mode<presentation>{\large}%
  \begin{description}
  \item[\texttt{/etc/issue}] --- 
  \item[\texttt{/etc/issue.net}] --- File containing message
    displayed when users log in via \texttt{telnet} (which should
    be never! \texttt{:-)}
  \item[\texttt{/etc/motd}] --- Message of the day file: displayed
    when log in via \texttt{ssh} or the console
  \end{description}
\end{frame}

 
\section{/etc/issue}
\label{sec:issue}

\begin{frame}[fragile]
  \frametitle{Customize the Local Login screen with \texttt{/etc/issue}}
  \begin{itemize}
    \pause
  \item The login screen for Fedora Core 4 looks like this:
\begin{semiverbatim}
Fedora Core release 4 (Stentz)
Kernel 2.6.13-1.1526_FC4smp on an i686

login:
\end{semiverbatim}
    \pause
  \item The \texttt{getty} process spawned by \textsf{init} presents
    the contents of the file \texttt{/etc/issue} and provides a
    \texttt{login:} prompt for the user.%
    \pause%
  \item The file \texttt{/etc/issue}
\begin{semiverbatim}
\cmd{cat /etc/issue}
Fedora Core release 4 (Stentz)
Kernel \textbackslash{}r on an \textbackslash{}m
\end{semiverbatim}
  \end{itemize}
\end{frame}

\subsection{Manpage for \texttt{issue}}
\label{sec:man-issue}

\begin{frame}[fragile]
\frametitle{{man issue}}
{\mode<presentation>{\scriptsize}\mode<article>{\footnotesize}
\begin{semiverbatim}
ISSUE(5)               Linux Programmer's Manual             ISSUE(5)

NAME
       issue - pre-login message and identification file

DESCRIPTION

       The  file  /etc/issue  is  a text file which contains a message
       or system identification to be printed before the login
       prompt.   It may  contain  various  @char  and \textbackslash{}char sequences,
       if supported by mingetty(1).

FILES
       /etc/issue

SEE ALSO
       mingetty(1), motd(5) 

Linux                        1993-07-24                      ISSUE(5)
\end{semiverbatim}
}
\end{frame}

\subsection{getty strings you can use in issue}
\label{sec:getty-strings-issue}

\begin{frame}[fragile]
\frametitle{{man getty}---embedded in the \texttt{/etc/issue}}
\begin{tabularx}{\linewidth}{@{}>{\ttfamily}lY@{}}
  \textbackslash{}d & insert current day (localtime),\\
  \textbackslash{}l & insert line on which mingetty is running,\\
  \textbackslash{}m & inserts machine architecture (\texttt{uname -m}),\\
  \textbackslash{}n & inserts machine's network node hostname (\texttt{uname -n}),\\
  \textbackslash{}o & inserts domain name,\\
  \textbackslash{}r & inserts operating system release (\texttt{uname -r}),\\
  \textbackslash{}t & insert current time (localtime),\\
  \textbackslash{}s & inserts operating system name,\\
  \textbackslash{}u & insert the number of current users logged in\\
  \textbackslash{}U & inserts ``1 user'' or ``\meta{n} users'', where
  \meta{n} is the number of users logged in\\
  \textbackslash{}v & inserts operating system version
  (\texttt{uname~-v}).
\end{tabularx}
\end{frame}

\section{\texttt{telnet} and issue.net}
\label{sec:issue.net}

\begin{frame}[fragile]
  \frametitle{Telnet uses \texttt{/etc/issue.net}}%
  The following sequences are supported by telnetd:
  \par\bigskip\par
  \begin{tabularx}{\linewidth}{@{}>{\ttfamily}lY@{}}
    \%l  & show the current tty\\
    \%h, \%n & show the system node name (FQDN)\\
    \%D, \%o & show the name of the NIS domain\\
    \%d, \%t & show the current time and date\\
    \%s  & show the name of the operating system\\
    \%m  & show the machine (hardware) type\\
    \%r  & show the operating system release\\
    \%v  & show the operating system version\\
    \%\% & display a single `\texttt{\%}' character\\
  \end{tabularx}
\end{frame}
%-----------------------------------------------------------

\section{Message of the Day: \texttt{motd}}
\label{sec:motd}


%==============================================================================
%==============================================================================
\begin{frame}[fragile]
  \frametitle{Message of the Day --- \texttt{motd}}
  \framesubtitle{Login Sequence}
  \begin{itemize}
    \pause
  \item Contents of \texttt{/etc/issue} is displayed.
    \pause
  \item \texttt{getty} displays the login prompt.
    \pause
  \item \texttt{/bin/login} handles the login process.
    \begin{itemize}
      \pause
    \item User is authorized.
      \pause
    \item Contents of \texttt{/etc/motd} is displayed.
      \pause
    \item The login shell is executed.
    \end{itemize}
  \end{itemize}
\end{frame}
%-----------------------------------------------------------



%==============================================================================


\subsection{Manpage for \texttt{motd}}
\label{sec:man-motd}



%==============================================================================
\begin{frame}[fragile]
  \frametitle{Manpage for \texttt{motd}}
  {\mode<presentation>{\scriptsize}\mode<article>{\footnotesize}
\begin{verbatim}
MOTD(5)               Linux Programmer's Manual             MOTD(5)

NAME
       motd - message of the day

DESCRIPTION
       The  contents of /etc/motd are displayed by login(1) after a
       successful login but just before it executes the login shell.

       The abbreviation "motd" stands for "message of the day", and
       this  file has  been  traditionally  used  for  exactly that
       (it requires much less disk space than mail to all users).

FILES
       /etc/motd

SEE ALSO
       login(1), issue(5)

Linux                        1992-12-29                     MOTD(5)
\end{verbatim}
  }
\end{frame}
%-----------------------------------------------------------

%==============================================================================

\subsection{\texttt{motd} in action}
\label{sec:motd-in-action}


%==============================================================================
\begin{frame}[fragile]
  \frametitle{\texttt{motd}}%
  \pause
  % \overlay{1}
\begin{semiverbatim}
\cmd{cat /etc/motd}
G'day! :-)
\cmd{exit}

\end{semiverbatim} 
  \hrule%
  \pause%
  %\overlay{2}
\begin{semiverbatim} 

Red Hat Linux release 9 (Shrike)
Kernel 2.4.20-8 on an i686

marsbar login: \textbf{geoffrey}
Password:
Last login: Wed Sep 10 22:23:15 on tty2
G'day! :-)
You have new mail.
$
\end{semiverbatim}
\end{frame}
%-----------------------------------------------------------

\begin{frame}[fragile]
  \frametitle{It also works with \texttt{ssh}}
\begin{semiverbatim}
\cmd{ssh nicku.org}
Last login: Thu Oct 27 10:51:21 2005 from nicku.org
G'day! :-)
\cmd{cat /etc/motd}
G'day! :-)
$
\end{semiverbatim}
\end{frame}
%==============================================================================

\section{Ways of notifying users}
\label{sec:ways-of-notifiying-users}


%==============================================================================
\begin{frame}[fragile]
  \frametitle{Notify Users of System Related Issues}
  \begin{description}
  \item[Login Screen] \texttt{/etc/issue}
    \pause
    % \overlay{1}
  \item[Telnet Login Screen] \texttt{/etc/issue.net}
    \pause
    % \overlay{2}
  \item[Login message] \texttt{/etc/motd}
    \pause
    % \overlay{3}
  \item[wall] Message to all terminals
    \pause
    % \overlay{4}
  \item[talk] Split screen message
    \pause
    % \overlay{5}
  \item[Email] Users list
    \pause
    % \overlay{6}
  \item[Phone] They have a phone
    \pause
    % \overlay{7}
  \item[Visit] They have an office 
  \end{description}
\end{frame}

\mode<presentation>
{%
\begin{frame}
  \frametitle{Topics Covered}
  %\footnotesize
  %\begin{multicols}{2}
    \tableofcontents[pausesections,pausesubsections]
  %\end{multicols}
  % You might wish to add the option [pausesections]
\end{frame}
}


\section{License Of This Document}
\label{sec:license}

\begin{frame}
  \frametitle{License Of This Document}%
  \raggedright%
  Copyright \copyright\ 2005, 2003 Geoffrey Robertson <ge@ffrey.com>
  and Nick Urbanik <nicku@nicku.org>.
  \par
  Permission is granted to make and distribute verbatim copies or
  modified versions of this document provided that this copyright
  notice and this permission notice are preserved on all copies under
  the terms of the GNU General Public License as published by the Free
  Software Foundation---either version 2 of the License or (at your
  option) any later version.
\end{frame}
\end{document}