lfs-book-zh_CN/chapter06/bzip2.xml

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<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
  "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
  <!ENTITY % general-entities SYSTEM "../general.ent">
  %general-entities;
]>

<sect1 id="ch-system-bzip2" role="wrap">
  <?dbhtml filename="bzip2.html"?>

  <sect1info condition="script">
    <productname>bzip2</productname>
    <productnumber>&bzip2-version;</productnumber>
    <address>&bzip2-url;</address>
  </sect1info>

  <title>Bzip2-&bzip2-version;</title>

  <indexterm zone="ch-system-bzip2">
    <primary sortas="a-Bzip2">Bzip2</primary>
  </indexterm>

  <sect2 role="package">
    <title/>

    <!--para>The Bzip2 package contains programs for compressing and decompressing
    files. Compressing text files with <command>bzip2</command> yields a much
    better compression percentage than with the traditional
    <command>gzip</command>.</para-->
    <para>Bzip2 软件包包含用于压缩和解压缩文件的程序。使用
		<command>bzip2</command> 压缩文本文件可以获得比传统的
		<command>gzip</command> 高到不知哪里去的压缩率。</para>

    <segmentedlist>
      <segtitle>&buildtime;</segtitle>
      <segtitle>&diskspace;</segtitle>

      <seglistitem>
        <seg>&bzip2-ch6-sbu;</seg>
        <seg>&bzip2-ch6-du;</seg>
      </seglistitem>
    </segmentedlist>

  </sect2>

  <sect2 role="installation">
    <title>安装 Bzip2</title>

	<para>应用一个补丁，以安装该软件包的文档：</para>

<screen><userinput remap="pre">patch -Np1 -i ../&bzip2-docs-patch;</userinput></screen>

   <para>以下命令保证安装的符号链接是相对的：</para>

<screen><userinput remap="pre">sed -i 's@\(ln -s -f \)$(PREFIX)/bin/@\1@' Makefile</userinput></screen>

    <para>确保 man 页面被安装到正确位置：</para>

<screen><userinput remap="pre">sed -i "s@(PREFIX)/man@(PREFIX)/share/man@g" Makefile</userinput></screen>

    <para>执行以下命令，准备编译 Bzip2：</para>

<screen><userinput remap="make">make -f Makefile-libbz2_so
make clean</userinput></screen>

    <variablelist>
      <title>make 命令参数的含义：</title>

      <varlistentry>
        <term><parameter>-f Makefile-libbz2_so</parameter></term>
        <listitem>
          <!--para>This will cause Bzip2 to be built using a different
          <filename>Makefile</filename> file, in this case the
          <filename>Makefile-libbz2_so</filename> file, which creates a dynamic
          <filename class="libraryfile">libbz2.so</filename> library and links
          the Bzip2 utilities against it.</para-->
          <para>该命令使用一个不同的 <filename>Makefile</filename>
			  文件构建 Bzip2，对于我们的例子来说就是使用
			  <filename>Makefile-libbz2_so</filename> 文件。
			  它创建一个共享库
			  <filename class="libraryfile">libbz2.so</filename>，
			  并将 Bzip2 工具链接到这个库。</para>
        </listitem>
      </varlistentry>

    </variablelist>

    <para>编译并测试该软件包：</para>

<screen><userinput remap="make">make</userinput></screen>

    <para>安装软件包中的程序：</para>

<screen><userinput remap="install">make PREFIX=/usr install</userinput></screen>

    <para>安装链接到共享库的 <command>bzip2</command> 二进制程序到
    <filename class="directory">/bin</filename> 目录，
    创建必要的符号链接，并进行清理：</para>

<screen><userinput remap="install">cp -v bzip2-shared /bin/bzip2
cp -av libbz2.so* /lib
ln -sv ../../lib/libbz2.so.1.0 /usr/lib/libbz2.so
rm -v /usr/bin/{bunzip2,bzcat,bzip2}
ln -sv bzip2 /bin/bunzip2
ln -sv bzip2 /bin/bzcat</userinput></screen>

  </sect2>

  <sect2 id="contents-bzip2" role="content">
    <title>Bzip2 的内容</title>

    <segmentedlist>
      <segtitle>安装的程序</segtitle>
      <segtitle>安装的库</segtitle>
      <segtitle>安装的目录</segtitle>

      <seglistitem>
        <seg>bunzip2 (链接到 bzip2), bzcat (链接到 bzip2), bzcmp (链接到
        bzdiff), bzdiff, bzegrep (链接到 bzgrep), bzfgrep (链接到 bzgrep),
		bzgrep, bzip2, bzip2recover, bzless (链接到bzmore), 
		以及 bzmore</seg>
        <seg>libbz2.{a,so}</seg>
        <seg>/usr/share/doc/bzip2-&bzip2-version;</seg>
      </seglistitem>
    </segmentedlist>

    <variablelist>
      <bridgehead renderas="sect3">简要描述</bridgehead>
      <?dbfo list-presentation="list"?>
      <?dbhtml list-presentation="table"?>

      <varlistentry id="bunzip2">
        <term><command>bunzip2</command></term>
        <listitem>
          <para>解压缩 bzip 压缩文件</para>
          <indexterm zone="ch-system-bzip2 bunzip2">
            <primary sortas="b-bunzip2">bunzip2</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="bzcat">
        <term><command>bzcat</command></term>
        <listitem>
          <para>解压缩到标准输出</para>
          <indexterm zone="ch-system-bzip2 bzcat">
            <primary sortas="b-bzcat">bzcat</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="bzcmp">
        <term><command>bzcmp</command></term>
        <listitem>
          <para>对 bzip 压缩过的文件运行 <command>cmp</command></para>
          <indexterm zone="ch-system-bzip2 bzcmp">
            <primary sortas="b-bzcmp">bzcmp</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="bzdiff">
        <term><command>bzdiff</command></term>
        <listitem>
          <para>对 bzip 压缩过的文件运行 <command>diff</command></para>
          <indexterm zone="ch-system-bzip2 bzdiff">
            <primary sortas="b-bzdiff">bzdiff</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="bzegrep">
        <term><command>bzegrep</command></term>
        <listitem>
          <para>对 bzip 压缩过的文件运行 <command>egrep</command> 命令</para>
          <indexterm zone="ch-system-bzip2 bzegrep">
            <primary sortas="b-bzegrep">bzegrep</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="bzfgrep">
        <term><command>bzfgrep</command></term>
        <listitem>
          <para>对 bzip 压缩过的文件运行 <command>fgrep</command> 命令</para>
          <indexterm zone="ch-system-bzip2 bzfgrep">
            <primary sortas="b-bzfgrep">bzfgrep</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="bzgrep">
        <term><command>bzgrep</command></term>
        <listitem>
          <para>对 bzip 压缩过的文件运行 <command>grep</command> 命令</para>
          <indexterm zone="ch-system-bzip2 bzgrep">
            <primary sortas="b-bzgrep">bzgrep</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="bzip2">
        <term><command>bzip2</command></term>
        <listitem>
          <!--para>Compresses files using the Burrows-Wheeler block sorting text
          compression algorithm with Huffman coding; the compression rate is
          better than that achieved by more conventional compressors using
          <quote>Lempel-Ziv</quote> algorithms, like <command>gzip</command></para-->
          <para>使用 Burrows-Wheeler 块排序文本压缩算法和 Huffman
			  编码压缩文件；其压缩率优于更常见的使用
			  <quote>Lempel-Ziv</quote> 算法的压缩工具，如
			  <command>gzip</command></para>
          <indexterm zone="ch-system-bzip2 bzip2">
            <primary sortas="b-bzip2">bzip2</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="bzip2recover">
        <term><command>bzip2recover</command></term>
        <listitem>
          <para>试图从损坏的 bzip2 压缩文件中恢复数据</para>
          <indexterm zone="ch-system-bzip2 bzip2recover">
            <primary sortas="b-bzip2recover">bzip2recover</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="bzless">
        <term><command>bzless</command></term>
        <listitem>
          <para>对 bzip 压缩过的文件运行 <command>less</command> 命令</para>
          <indexterm zone="ch-system-bzip2 bzless">
            <primary sortas="b-bzless">bzless</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="bzmore">
        <term><command>bzmore</command></term>
        <listitem>
          <para>对 bzip 压缩过的文件运行 <command>more</command> 命令</para>
          <indexterm zone="ch-system-bzip2 bzmore">
            <primary sortas="b-bzmore">bzmore</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="libbz2">
        <term><filename class="libraryfile">libbz2</filename></term>
        <listitem>
          <para>这个库实现基于 Burrows-Wheeler 算法的无损块排序数据压缩
          </para>
          <indexterm zone="ch-system-bzip2 libbz2">
            <primary sortas="c-libbz2">libbz2</primary>
          </indexterm>
        </listitem>
      </varlistentry>

    </variablelist>

  </sect2>

</sect1>