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 <preface xmlns="http://docbook.org/ns/docbook"
   xmlns:xlink="http://www.w3.org/1999/xlink" version="5.0"
   xml:id="book-preface">
   <title>Preface</title>
 
   <bridgehead xml:id="preface-audience" renderas="sect1">Intended
   Audience</bridgehead>
 
   <para>The &os; newcomer will find that the first section of this
     book guides the user through the &os; installation process and
     gently introduces the concepts and conventions that underpin
     &unix;.  Working through this section requires little more than
     the desire to explore, and the ability to take on board new
     concepts as they are introduced.</para>
 
   <para>Once you have traveled this far, the second, far larger,
     section of the Handbook is a comprehensive reference to all manner
     of topics of interest to &os; system administrators.  Some of
     these chapters may recommend that you do some prior reading, and
     this is noted in the synopsis at the beginning of each
     chapter.</para>
 
   <para>For a list of additional sources of information, please see
     <xref linkend="bibliography"/>.</para>
 
   <bridgehead xml:id="preface-changes-from3" renderas="sect1">Changes
     from the Third Edition</bridgehead>
 
   <para>The current online version of the Handbook represents the
     cumulative effort of many hundreds of contributors over the past
     10 years.  The following are some of the significant changes since
     the two volume third edition was published in 2004:</para>
 
   <itemizedlist>
     <listitem>
       <para><xref linkend="dtrace"/> has been added with information
 	about the powerful &dtrace; performance analysis tool.</para>
     </listitem>
 
     <listitem>
       <para><xref linkend="filesystems"/> has been added with
 	information about non-native file systems in &os;, such as ZFS
 	from &sun;.</para>
     </listitem>
 
     <listitem>
       <para><xref linkend="audit"/> has been added to cover the new
 	auditing capabilities in &os; and explain its use.</para>
     </listitem>
 
     <listitem>
       <para><xref linkend="virtualization"/> has been added with
 	information about installing &os; on virtualization
 	software.</para>
     </listitem>
 
     <listitem>
       <para><xref linkend="bsdinstall"/> has been added to cover
 	installation of &os; using the new installation utility,
 	<application>bsdinstall</application>.</para>
     </listitem>
   </itemizedlist>
 
   <bridgehead xml:id="preface-changes-from2" renderas="sect1">Changes
     from the Second Edition (2004)</bridgehead>
 
   <para>The third edition was the culmination of over two years of
     work by the dedicated members of the &os; Documentation
     Project.  The printed edition grew to such a size that it was
     necessary to publish as two separate volumes.  The following are
     the major changes in this new edition:</para>
 
   <itemizedlist>
     <listitem>
       <para><xref linkend="config-tuning"/> has been expanded with new
 	information about the ACPI power and resource management, the
 	<command>cron</command> system utility, and more kernel tuning
 	options.</para>
     </listitem>
 
     <listitem>
       <para><xref linkend="security"/> has been expanded with new
 	information about virtual private networks (VPNs), file system
 	access control lists (ACLs), and security advisories.</para>
     </listitem>
 
     <listitem>
       <para><xref linkend="mac"/> is a new chapter with this edition.
 	It explains what MAC is and how this mechanism can be used to
 	secure a &os; system.</para>
     </listitem>
 
     <listitem>
       <para><xref linkend="disks"/> has been expanded with new
 	information about USB storage devices, file system snapshots,
 	file system quotas, file and network backed filesystems, and
 	encrypted disk partitions.</para>
     </listitem>
 
     <listitem>
       <para>A troubleshooting section has been added to <xref
 	  linkend="ppp-and-slip"/>.</para>
     </listitem>
 
     <listitem>
       <para><xref linkend="mail"/> has been expanded with new
 	information about using alternative transport agents, SMTP
 	authentication, UUCP, <application>fetchmail</application>,
 	<application>procmail</application>, and other advanced
 	topics.</para>
     </listitem>
 
     <listitem>
       <para><xref linkend="network-servers"/> is all new with this
 	edition.  This chapter includes information about setting up
 	the <application>Apache HTTP Server</application>,
 	<application>ftpd</application>, and setting up a server for
 	&microsoft; &windows; clients with
 	<application>Samba</application>.  Some sections from <xref
 	  linkend="advanced-networking"/> were moved here to improve
 	the presentation.</para>
     </listitem>
 
     <listitem>
       <para><xref linkend="advanced-networking"/> has been expanded
 	with new information about using &bluetooth; devices with
 	&os;, setting up wireless networks, and Asynchronous Transfer
 	Mode (ATM) networking.</para>
     </listitem>
 
     <listitem>
       <para>A glossary has been added to provide a central location
 	for the definitions of technical terms used throughout the
 	book.</para>
     </listitem>
 
     <listitem>
       <para>A number of aesthetic improvements have been made to the
 	tables and figures throughout the book.</para>
     </listitem>
   </itemizedlist>
 
   <bridgehead xml:id="preface-changes" renderas="sect1">Changes from
     the First Edition (2001)</bridgehead>
 
     <para>The second edition was the culmination of over two years of
       work by the dedicated members of the &os; Documentation Project.
       The following were the major changes in this edition:</para>
 
 <!-- Talk a little about justification and other stylesheet changes? -->
 
     <itemizedlist>
       <listitem>
 	<para>A complete Index has been added.</para>
       </listitem>
 
       <listitem>
 	<para>All ASCII figures have been replaced by graphical
 	  diagrams.</para>
       </listitem>
 
       <listitem>
 	<para>A standard synopsis has been added to each chapter to
 	  give a quick summary of what information the chapter
 	  contains, and what the reader is expected to know.</para>
       </listitem>
 
       <listitem>
 	<para>The content has been logically reorganized into three
 	  parts: <quote>Getting Started</quote>, <quote>System
 	  Administration</quote>, and
 	  <quote>Appendices</quote>.</para>
       </listitem>
 
       <listitem>
 	<para><xref linkend="install"/> was completely rewritten with
 	  many screenshots to make it much easier for new users to
 	  grasp the text.</para>
       </listitem>
 
       <listitem>
 	<para><xref linkend="basics"/> has been expanded to contain
 	  additional information about processes, daemons, and
 	  signals.</para>
       </listitem>
 
       <listitem>
 	<para><xref linkend="ports"/> has been expanded to contain
 	  additional information about binary package
 	  management.</para>
       </listitem>
 
       <listitem>
 	<para><xref linkend="x11"/> has been completely rewritten with
 	  an emphasis on using modern desktop technologies such as
 	  <application>KDE</application> and
 	  <application>GNOME</application> on &xfree86; 4.X.</para>
       </listitem>
 
       <listitem>
 	<para><xref linkend="boot"/> has been expanded.</para>
       </listitem>
 
       <listitem>
 	<para><xref linkend="disks"/> has been written from what used
 	  to be two separate chapters on <quote>Disks</quote> and
 	  <quote>Backups</quote>.  We feel that the topics are easier
 	  to comprehend when presented as a single chapter.  A section
 	  on RAID (both hardware and software) has also been
 	  added.</para>
       </listitem>
 
       <listitem>
 	<para><xref linkend="serialcomms"/> has been completely
 	  reorganized and updated for &os; 4.X/5.X.</para>
       </listitem>
 
       <listitem>
 	<para><xref linkend="ppp-and-slip"/> has been substantially
 	  updated.</para>
       </listitem>
 
       <listitem>
 	<para>Many new sections have been added to <xref
 	    linkend="advanced-networking"/>.</para>
       </listitem>
 
       <listitem>
 	<para><xref linkend="mail"/> has been expanded to include more
 	  information about configuring
 	  <application>sendmail</application>.</para>
       </listitem>
 
       <listitem>
 	<para><xref linkend="linuxemu"/> has been expanded to include
 	  information about installing
 	  <application>&oracle;</application> and
 	  <application>&sap.r3;</application>.</para>
       </listitem>
 
       <listitem>
 	<para>The following new topics are covered in this second
 	  edition:</para>
 
 	<itemizedlist>
 	  <listitem>
 	    <para><xref linkend="config-tuning"/>.</para>
 	  </listitem>
 
 	  <listitem>
 	    <para><xref linkend="multimedia"/>.</para>
 	  </listitem>
 	</itemizedlist>
       </listitem>
     </itemizedlist>
 
     <bridgehead xml:id="preface-overview"
       renderas="sect1">Organization of This Book</bridgehead>
 
   <para>This book is split into five logically distinct sections.
     The first section, <emphasis>Getting Started</emphasis>, covers
     the installation and basic usage of &os;.  It is expected that
     the reader will follow these chapters in sequence, possibly
     skipping chapters covering familiar topics.  The second section,
     <emphasis>Common Tasks</emphasis>, covers some frequently used
     features of &os;.  This section, and all subsequent sections,
     can be read out of order.  Each chapter begins with a succinct
     synopsis that describes what the chapter covers and what the
     reader is expected to already know.  This is meant to allow the
     casual reader to skip around to find chapters of interest.  The
     third section, <emphasis>System Administration</emphasis>, covers
     administration topics.  The fourth section, <emphasis>Network
       Communication</emphasis>, covers networking and server topics.
     The fifth section contains appendices of reference
     information.</para>
 
   <variablelist>
 
 <!-- Part I - Introduction -->
 
     <varlistentry>
       <term><emphasis><xref linkend="introduction"/></emphasis></term>
 
       <listitem>
 	<para>Introduces &os; to a new user.  It describes the
 	  history of the &os; Project, its goals and development
 	  model.</para>
       </listitem>
     </varlistentry>
 
     <varlistentry>
       <term><emphasis><xref linkend="bsdinstall"/></emphasis></term>
 
       <listitem>
 	<para>Walks a user through the entire installation process of
 	  &os;&nbsp;9.<replaceable>x</replaceable> and later using
 	  <application>bsdinstall</application>.</para>
       </listitem>
     </varlistentry>
 
     <varlistentry>
       <term><emphasis><xref linkend="install"/></emphasis></term>
 
       <listitem>
 	<para>Walks a user through the entire installation process of
 	  &os;&nbsp;8.<replaceable>x</replaceable> and earlier using
 	  <application>sysinstall</application>.  Some advanced
 	  installation topics, such as installing through a serial
 	  console, are also covered.</para>
       </listitem>
     </varlistentry>
 
     <varlistentry>
       <term><emphasis><xref linkend="basics"/></emphasis></term>
 
       <listitem>
 	<para>Covers the basic commands and functionality of the
 	  &os; operating system.  If you are familiar with &linux;
 	  or another flavor of &unix; then you can probably skip this
 	  chapter.</para>
       </listitem>
     </varlistentry>
 
     <varlistentry>
       <term><emphasis><xref linkend="ports"/></emphasis></term>
 
       <listitem>
 	<para>Covers the installation of third-party software with
 	  both &os;'s innovative <quote>Ports Collection</quote> and
 	  standard binary packages.</para>
       </listitem>
     </varlistentry>
 
     <varlistentry>
       <term><emphasis><xref linkend="x11"/></emphasis></term>
 
       <listitem>
 	<para>Describes the X Window System in general and using X11
 	  on &os; in particular.  Also describes common desktop
 	  environments such as <application>KDE</application> and
 	  <application>GNOME</application>.</para>
       </listitem>
     </varlistentry>
 
 <!-- Part II Common Tasks -->
 
     <varlistentry>
       <term><emphasis><xref linkend="desktop"/></emphasis></term>
 
       <listitem>
 	<para>Lists some common desktop applications, such as web
 	  browsers and productivity suites, and describes how to
 	  install them on &os;.</para>
       </listitem>
     </varlistentry>
 
     <varlistentry>
       <term><emphasis><xref linkend="multimedia"/></emphasis></term>
       <listitem>
 	<para>Shows how to set up sound and video playback support
 	  for your system.  Also describes some sample audio and video
 	  applications.</para>
       </listitem>
     </varlistentry>
 
     <varlistentry>
       <term><emphasis><xref linkend="kernelconfig"/></emphasis></term>
 
       <listitem>
 	<para>Explains why you might need to configure a new kernel
 	  and provides detailed instructions for configuring,
 	  building, and installing a custom kernel.</para>
       </listitem>
     </varlistentry>
 
     <varlistentry>
       <term><emphasis><xref linkend="printing"/></emphasis></term>
 
       <listitem>
 	<para>Describes managing printers on &os;, including
 	  information about banner pages, printer accounting, and
 	  initial setup.</para>
       </listitem>
     </varlistentry>
 
     <varlistentry>
       <term><emphasis><xref linkend="linuxemu"/></emphasis></term>
 
       <listitem>
 	<para>Describes the &linux; compatibility features of &os;.
 	  Also provides detailed installation instructions for many
 	  popular &linux; applications such as
 	  <application>&oracle;</application> and
 	  <application>&mathematica;</application>.</para>
       </listitem>
     </varlistentry>
 
 <!-- Part III - System Administration -->
 
     <varlistentry>
       <term><emphasis><xref
 	    linkend="config-tuning"/></emphasis></term>
 
       <listitem>
 	<para>Describes the parameters available for system
 	  administrators to tune a &os; system for optimum
 	  performance.  Also describes the various configuration files
 	  used in &os; and where to find them.</para>
       </listitem>
     </varlistentry>
 
     <varlistentry>
       <term><emphasis><xref linkend="boot"/></emphasis></term>
 
       <listitem>
 	<para>Describes the &os; boot process and explains how to
 	  control this process with configuration options.</para>
       </listitem>
     </varlistentry>
 
     <varlistentry>
       <term><emphasis><xref linkend="security"/></emphasis></term>
 
       <listitem>
 	<para>Describes many different tools available to help keep
 	  your &os; system secure, including Kerberos, IPsec and
 	  OpenSSH.</para>
       </listitem>
     </varlistentry>
 
     <varlistentry>
       <term><emphasis><xref linkend="jails"/></emphasis></term>
 
       <listitem>
 	<para>Describes the jails framework, and the improvements of
 	  jails over the traditional chroot support of &os;.</para>
       </listitem>
     </varlistentry>
 
     <varlistentry>
       <term><emphasis><xref linkend="mac"/></emphasis></term>
 
       <listitem>
 	<para>Explains what Mandatory Access Control (MAC) is and
 	  how this mechanism can be used to secure a &os;
 	  system.</para>
       </listitem>
     </varlistentry>
 
     <varlistentry>
       <term><emphasis><xref linkend="audit"/></emphasis></term>
 
       <listitem>
 	<para>Describes what &os; Event Auditing is, how it can be
 	  installed, configured, and how audit trails can be inspected
 	  or monitored.</para>
       </listitem>
     </varlistentry>
 
     <varlistentry>
       <term><emphasis><xref linkend="disks"/></emphasis></term>
 
       <listitem>
 	<para>Describes how to manage storage media and filesystems
 	  with &os;.  This includes physical disks, RAID arrays,
 	  optical and tape media, memory-backed disks, and network
 	  filesystems.</para>
       </listitem>
     </varlistentry>
 
     <varlistentry>
       <term><emphasis><xref linkend="geom"/></emphasis></term>
 
       <listitem>
 	<para>Describes what the GEOM framework in &os; is and how
 	  to configure various supported RAID levels.</para>
       </listitem>
     </varlistentry>
 
     <varlistentry>
       <term><emphasis><xref linkend="filesystems"/></emphasis></term>
 
       <listitem>
 	<para>Examines support of non-native file systems in &os;,
 	  like the Z File System from &sun;.</para>
       </listitem>
     </varlistentry>
 
     <varlistentry>
       <term><emphasis><xref
 	    linkend="virtualization"/></emphasis></term>
 
       <listitem>
 	<para>Describes what virtualization systems offer, and how
 	  they can be used with &os;.</para>
       </listitem>
     </varlistentry>
 
     <varlistentry>
       <term><emphasis><xref linkend="l10n"/></emphasis></term>
 
       <listitem>
 	<para>Describes how to use &os; in languages other than
 	  English.  Covers both system and application level
 	  localization.</para>
       </listitem>
     </varlistentry>
 
     <varlistentry>
       <term><emphasis><xref
 	    linkend="updating-upgrading"/></emphasis></term>
 
       <listitem>
 	<para>Explains the differences between &os;-STABLE,
 	  &os;-CURRENT, and &os; releases.  Describes which users
 	  would benefit from tracking a development system and
 	  outlines that process.  Covers the methods users may take
 	  to update their system to the latest security
 	  release.</para>
       </listitem>
     </varlistentry>
 
     <varlistentry>
       <term><emphasis><xref linkend="dtrace"/></emphasis></term>
 
       <listitem>
 	<para>Describes how to configure and use the &dtrace; tool
 	  from &sun; in &os;.  Dynamic tracing can help locate
 	  performance issues, by performing real time system
 	  analysis.</para>
       </listitem>
     </varlistentry>
 
 <!-- Part IV - Network Communications -->
 
     <varlistentry>
       <term><emphasis><xref linkend="serialcomms"/></emphasis></term>
 
       <listitem>
 	<para>Explains how to connect terminals and modems to your
 	  &os; system for both dial in and dial out
 	  connections.</para>
       </listitem>
     </varlistentry>
 
     <varlistentry>
       <term><emphasis><xref linkend="ppp-and-slip"/></emphasis></term>
 
       <listitem>
 	<para>Describes how to use PPP to connect to remote systems
 	  with &os;.</para>
       </listitem>
     </varlistentry>
 
     <varlistentry>
       <term><emphasis><xref linkend="mail"/></emphasis></term>
 
       <listitem>
 	<para>Explains the different components of an email server
 	  and dives into simple configuration topics for the most
 	  popular mail server software:
 	  <application>sendmail</application>.</para>
       </listitem>
     </varlistentry>
 
     <varlistentry>
       <term><emphasis><xref
 	    linkend="network-servers"/></emphasis></term>
 
       <listitem>
 	<para>Provides detailed instructions and example configuration
 	  files to set up your &os; machine as a network filesystem
 	  server, domain name server, network information system
 	  server, or time synchronization server.</para>
       </listitem>
     </varlistentry>
 
     <varlistentry>
       <term><emphasis><xref linkend="firewalls"/></emphasis></term>
 
       <listitem>
 	<para>Explains the philosophy behind software-based firewalls
 	  and provides detailed information about the configuration
 	  of the different firewalls available for &os;.</para>
       </listitem>
     </varlistentry>
 
     <varlistentry>
       <term><emphasis><xref
 	    linkend="advanced-networking"/></emphasis></term>
 
       <listitem>
 	<para>Describes many networking topics, including sharing an
 	  Internet connection with other computers on your LAN,
 	  advanced routing topics, wireless networking, &bluetooth;,
 	  ATM, IPv6, and much more.</para>
       </listitem>
     </varlistentry>
 
 <!-- Part V - Appendices -->
 
     <varlistentry>
       <term><emphasis><xref linkend="mirrors"/></emphasis></term>
 
       <listitem>
 	<para>Lists different sources for obtaining &os; media on
 	  CDROM or DVD as well as different sites on the Internet
 	  that allow you to download and install &os;.</para>
       </listitem>
     </varlistentry>
 
     <varlistentry>
       <term><emphasis><xref linkend="bibliography"/></emphasis></term>
 
       <listitem>
 	<para>This book touches on many different subjects that may
 	  leave you hungry for a more detailed explanation.  The
 	  bibliography lists many excellent books that are referenced
 	  in the text.</para>
       </listitem>
     </varlistentry>
 
     <varlistentry>
       <term><emphasis><xref linkend="eresources"/></emphasis></term>
 
       <listitem>
 	<para>Describes the many forums available for &os; users to
 	  post questions and engage in technical conversations about
 	  &os;.</para>
       </listitem>
     </varlistentry>
 
     <varlistentry>
       <term><emphasis><xref linkend="pgpkeys"/></emphasis></term>
 
       <listitem>
 	<para>Lists the PGP fingerprints of several &os;
 	  Developers.</para>
       </listitem>
     </varlistentry>
   </variablelist>
 
   <bridgehead xml:id="preface-conv" renderas="sect1">Conventions used
     in this book</bridgehead>
 
     <para>To provide a consistent and easy to read text, several
       conventions are followed throughout the book.</para>
 
     <bridgehead xml:id="preface-conv-typographic"
       renderas="sect2">Typographic Conventions</bridgehead>
 
   <variablelist>
     <varlistentry>
       <term><emphasis>Italic</emphasis></term>
 
       <listitem>
 	<para>An <emphasis>italic</emphasis> font is used for
 	  filenames, URLs, emphasized text, and the first usage of
 	  technical terms.</para>
       </listitem>
     </varlistentry>
 
     <varlistentry>
       <term><literal>Monospace</literal></term>
 
       <listitem>
 	<para>A <literal>monospaced</literal> font is used for error
 	  messages, commands, environment variables, names of ports,
 	  hostnames, user names, group names, device names, variables,
 	  and code fragments.</para>
       </listitem>
     </varlistentry>
 
     <varlistentry>
       <term><application>Bold</application></term>
 
       <listitem>
-	<para>A <application>bold</application> font is used for
+	<para>A <keycap>bold</keycap> font is used for
 	  applications, commands, and keys.</para>
       </listitem>
     </varlistentry>
   </variablelist>
 
 <!-- Var list -->
   <bridgehead xml:id="preface-conv-commands" renderas="sect2">User
     Input</bridgehead>
 
   <para>Keys are shown in <keycap>bold</keycap> to stand out from
     other text.  Key combinations that are meant to be typed
     simultaneously are shown with `<literal>+</literal>' between
     the keys, such as:</para>
 
   <para>
     <keycombo action="simul">
       <keycap>Ctrl</keycap>
       <keycap>Alt</keycap>
       <keycap>Del</keycap></keycombo></para>
 
   <para>Meaning the user should type the <keycap>Ctrl</keycap>,
     <keycap>Alt</keycap>, and <keycap>Del</keycap> keys at the same
     time.</para>
 
   <para>Keys that are meant to be typed in sequence will be separated
     with commas, for example:</para>
 
   <para>
     <keycombo action="simul">
       <keycap>Ctrl</keycap>
       <keycap>X</keycap>
     </keycombo>,
     <keycombo action="simul">
       <keycap>Ctrl</keycap>
       <keycap>S</keycap></keycombo></para>
 
   <para>Would mean that the user is expected to type the
     <keycap>Ctrl</keycap> and <keycap>X</keycap> keys simultaneously
     and then to type the <keycap>Ctrl</keycap> and <keycap>S</keycap>
     keys simultaneously.</para>
 
 <!-- How to type in key stokes, etc.. -->
   <bridgehead xml:id="preface-conv-examples"
     renderas="sect2">Examples</bridgehead>
 
   <para>Examples starting with <filename>C:\&gt;</filename>
     indicate a &ms-dos; command.  Unless otherwise noted, these
     commands may be executed from a <quote>Command Prompt</quote>
     window in a modern &microsoft.windows;
     environment.</para>
 
   <screen><prompt>E:\&gt;</prompt> <userinput>tools\fdimage floppies\kern.flp A:</userinput></screen>
 
   <para>Examples starting with &prompt.root; indicate a command that
     must be invoked as the superuser in &os;.  You can login as
     <systemitem class="username">root</systemitem> to type the
     command, or login as your normal account and use &man.su.1; to
     gain superuser privileges.</para>
 
   <screen>&prompt.root; <userinput>dd if=kern.flp of=/dev/fd0</userinput></screen>
 
   <para>Examples starting with &prompt.user; indicate a command that
     should be invoked from a normal user account.  Unless otherwise
     noted, C-shell syntax is used for setting environment variables
     and other shell commands.</para>
 
   <screen>&prompt.user; <userinput>top</userinput></screen>
 
   <bridgehead xml:id="preface-acknowledgements"
     renderas="sect1">Acknowledgments</bridgehead>
 
   <para>The book you are holding represents the efforts of many
     hundreds of people around the world.  Whether they sent in fixes
     for typos, or submitted complete chapters, all the contributions
     have been useful.</para>
 
   <para>Several companies have supported the development of this
     document by paying authors to work on it full-time, paying for
     publication, etc.  In particular, BSDi (subsequently acquired by
     <link xlink:href="http://www.windriver.com">Wind River
       Systems</link>) paid members of the &os; Documentation Project
     to work on improving this book full time leading up to the
     publication of the first printed edition in March 2000 (ISBN
     1-57176-241-8).  Wind River Systems then paid several additional
     authors to make a number of improvements to the print-output
     infrastructure and to add additional chapters to the text.  This
     work culminated in the publication of the second printed edition
     in November 2001 (ISBN 1-57176-303-1).  In 2003-2004, <link
       xlink:href="http://www.freebsdmall.com">&os; Mall, Inc</link>,
     paid several contributors to improve the Handbook in preparation
     for the third printed edition.</para>
 
 </preface>