lfs-book-zh_CN/chapter06/man.xml

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  <!ENTITY % general-entities SYSTEM "../general.ent">
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<sect1 id="ch-system-man" role="wrap">
<title>Man-&man-version;</title>
<?dbhtml filename="man.html"?>

<indexterm zone="ch-system-man"><primary sortas="a-Man">Man</primary></indexterm>

<sect2 role="package"><title/>
<para>The Man package contains programs for finding and viewing manual pages.</para>

<segmentedlist>
<segtitle>&buildtime;</segtitle>
<segtitle>&diskspace;</segtitle>
<seglistitem><seg>0.1 SBU</seg><seg>1.9MB</seg></seglistitem>
</segmentedlist>

<segmentedlist>
<segtitle>&dependencies;</segtitle>
<seglistitem><seg>Bash, Binutils, Coreutils, Gawk, GCC,
Glibc, Grep, Make, and Sed</seg></seglistitem>
</segmentedlist>
</sect2>

<sect2 role="installation">
<title>Installation of Man</title>

<para>Two adjustments need to be made to the sources of Man.</para>

<para>The first is a sed substitution to add the
<parameter>-R</parameter> switch to the <envar>PAGER</envar>
variable so that escape sequences are properly handled by Less:</para>

<screen><userinput>sed -i 's@-is@&amp;R@g' configure</userinput></screen>

<para>The second is also a sed substitution to comment out the
<quote>MANPATH /usr/man</quote> line in the
<filename>man.conf</filename> file to prevent redundant results when
using programs such as <command>whatis</command>:</para>

<screen><userinput>sed -i 's@MANPATH./usr/man@#&amp;@g' src/man.conf.in</userinput></screen>
 
<para>Prepare Man for compilation:</para>

<screen><userinput>./configure -confdir=/etc</userinput></screen>

<para>The meaning of the configure options:</para>

<variablelist>
<varlistentry>
<term><parameter>-confdir=/etc</parameter></term>
<listitem><para>This tells the <command>man</command> program to look for the
<filename>man.conf</filename> configuration file in the <filename
class="directory">/etc</filename> directory.</para></listitem>
</varlistentry>
</variablelist>

<para>Compile the package:</para>

<screen><userinput>make</userinput></screen>

<para>Install the package:</para>

<screen><userinput>make install</userinput></screen>

<note><para>To disable Select Graphic Rendition (SGR) escape
sequences, edit the <filename>man.conf</filename> file and
add the <parameter>-c</parameter> switch to
the <envar>NROFF</envar> variable.</para></note>

<para>If the character set uses 8-bit characters, search for the line
beginning with <quote>NROFF</quote> in
<filename>/etc/man.conf</filename>, and verify that it looks as
follows:</para>

<screen>NROFF  /usr/bin/nroff -Tlatin1 -mandoc</screen>

<para>Note that <quote>latin1</quote> should be used even if it is not
the character set of the locale. The reason is that, according to the
specification, <command>groff</command> has no means of typesetting
characters outside International Organization for Standards
(ISO) 8859-1 without some strange escape codes. When formatting manual
pages, <command>groff</command> thinks that they are in the ISO 8859-1
encoding and this <parameter>-Tlatin1</parameter> switch tells
<command>groff</command> to use the same encoding for output. Since
<command>groff</command> does no recoding of input characters, the
formatted result is really in the same encoding as input, and therefore
it is usable as the input for a pager.</para>

<para>This does not solve the problem of a non-working
<command>man2dvi</command> program for localized manual pages in
non-ISO 8859-1 locales. Also, it does not work with multibyte
character sets. The first problem does not currently have a solution.
The second issue is not of concern because the LFS installation does
not support multibyte character sets.</para>

<para>Additional information with regards to the compression of
man and info pages can be found in the BLFS book at
<ulink url="&blfs-root;view/cvs/postlfs/compressdoc.html"/>.</para>

</sect2>


<sect2 id="contents-man" role="content"><title>Contents of Man</title>

<segmentedlist>
<segtitle>Installed programs</segtitle>
<seglistitem><seg>apropos, makewhatis, man,
man2dvi, man2html, and whatis</seg></seglistitem>
</segmentedlist>

<variablelist><bridgehead renderas="sect3">Short Descriptions</bridgehead>
<?dbfo list-presentation="list"?>
<?dbhtml list-presentation="table"?>

<varlistentry id="apropos">
<term><command>apropos</command></term>
<listitem>
<para>Searches the whatis database and displays the short descriptions
of system commands that contain a given string</para>
<indexterm zone="ch-system-man apropos"><primary sortas="b-apropos">apropos</primary></indexterm>
</listitem>
</varlistentry>

<varlistentry id="makewhatis">
<term><command>makewhatis</command></term>
<listitem>
<para>Builds the whatis database; it reads all the manual pages in the
manpath and writes the name and a short description in the whatis
database for each page</para>
<indexterm zone="ch-system-man makewhatis"><primary sortas="b-makewhatis">makewhatis</primary></indexterm>
</listitem>
</varlistentry>

<varlistentry id="man">
<term><command>man</command></term>
<listitem>
<para>Formats and displays the requested on-line manual page</para>
<indexterm zone="ch-system-man man"><primary sortas="b-man">man</primary></indexterm>
</listitem>
</varlistentry>

<varlistentry id="man2dvi">
<term><command>man2dvi</command></term>
<listitem>
<para>Converts a manual page into dvi format</para>
<indexterm zone="ch-system-man man2dvi"><primary sortas="b-man2dvi">man2dvi</primary></indexterm>
</listitem>
</varlistentry>

<varlistentry id="man2html">
<term><command>man2html</command></term>
<listitem>
<para>Converts a manual page into HTML</para>
<indexterm zone="ch-system-man man2html"><primary sortas="b-man2html">man2html</primary></indexterm>
</listitem>
</varlistentry>

<varlistentry id="whatis">
<term><command>whatis</command></term>
<listitem>
<para>Searches the whatis database and displays the short descriptions
of system commands that contain the given keyword as a separate
word</para>
<indexterm zone="ch-system-man whatis"><primary sortas="b-whatis">whatis</primary></indexterm>
</listitem>
</varlistentry>
</variablelist>

</sect2>

</sect1>