lfs-book-zh_CN/chapter06/bzip2.xml

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<sect1 id="ch-system-bzip2" xreflabel="Bzip2" role="wrap">
<title>Bzip2-&bzip2-version;</title>
<?dbhtml filename="bzip2.html"?>

<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. On text files they achieve a much better compression than the
traditional <command>gzip</command>.</para>

<segmentedlist>
<segtitle>&buildtime;</segtitle>
<segtitle>&diskspace;</segtitle>
<seglistitem><seg>0.1 SBU</seg><seg>3.0 MB</seg></seglistitem>
</segmentedlist>

<segmentedlist>
<segtitle>Bzip2 installation depends on</segtitle>
<seglistitem><seg>Bash, Binutils, Coreutils, Diffutils,
GCC, Glibc, Make</seg></seglistitem>
</segmentedlist>
</sect2>

<sect2 role="installation">
<title>Installation of Bzip2</title>

<para>Prepare Bzip2 for compilation with:</para>

<screen><userinput>make -f Makefile-libbz2_so
make clean</userinput></screen>

<para>The <parameter>-f</parameter> flag 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>Compile the package:</para>

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

<para>If you are reinstalling Bzip2, you need to do
<userinput>rm -f /usr/bin/bz*</userinput> first, otherwise the following
<command>make install</command> will fail.</para>

<para>Install the programs:</para>

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

<para>Now install the shared <command>bzip2</command> binary into the
<filename class="directory">/bin</filename> directory, then make some
necessary symbolic links, and clean up:</para>

<screen><userinput>cp bzip2-shared /bin/bzip2
cp -a libbz2.so* /lib
ln -s ../../lib/libbz2.so.1.0 /usr/lib/libbz2.so
rm /usr/bin/{bunzip2,bzcat,bzip2}
ln -s bzip2 /bin/bunzip2
ln -s bzip2 /bin/bzcat</userinput></screen>

</sect2>


<sect2 id="contents-bzip2" role="content"><title>Contents of Bzip2</title>

<segmentedlist>
<segtitle>Installed programs</segtitle>
<segtitle>Installed libraries</segtitle>
<seglistitem><seg>bunzip2 (link to bzip2), bzcat (link to bzip2), bzcmp, bzdiff,
bzegrep, bzfgrep, bzgrep, bzip2, bzip2recover, bzless and bzmore</seg>
<seg>libbz2.a, libbz2.so (link to libbz2.so.1.0), libbz2.so.1.0 (link to 
libbz2.so.&bzip2-version;) and libbz2.so.&bzip2-version;</seg></seglistitem>
</segmentedlist>

<variablelist><title>Short descriptions</title>

<varlistentry id="bunzip2">
<term><command>bunzip2</command></term>
<listitem>
<indexterm zone="ch-system-bzip2 bunzip2"><primary sortas="b-bunzip2">bunzip2</primary></indexterm>
<para>decompresses bzipped files.</para>
</listitem>
</varlistentry>

<varlistentry id="bzcat">
<term><command>bzcat</command></term>
<listitem>
<indexterm zone="ch-system-bzip2 bzcat"><primary sortas="b-bzcat">bzcat</primary></indexterm>
<para>decompresses to standard output.</para>
</listitem>
</varlistentry>

<varlistentry id="bzcmp">
<term><command>bzcmp</command></term>
<listitem>
<indexterm zone="ch-system-bzip2 bzcmp"><primary sortas="b-bzcmp">bzcmp</primary></indexterm>
<para>runs <command>cmp</command> on bzipped files.</para>
</listitem>
</varlistentry>

<varlistentry id="bzdiff">
<term><command>bzdiff</command></term>
<listitem>
<indexterm zone="ch-system-bzip2 bzdiff"><primary sortas="b-bzdiff">bzdiff</primary></indexterm>
<para>runs <command>diff</command> on bzipped files.</para>
</listitem>
</varlistentry>

<varlistentry id="bzgrep">
<term><command>bzgrep</command></term>
<listitem>
<indexterm zone="ch-system-bzip2 bzgrep"><primary sortas="b-bzgrep">bzgrep</primary></indexterm>
<para>and friends run <command>grep</command> on bzipped files.</para>
</listitem>
</varlistentry>

<varlistentry id="bzip2">
<term><command>bzip2</command></term>
<listitem>
<indexterm zone="ch-system-bzip2 bzip2"><primary sortas="b-bzip2">bzip2</primary></indexterm>
<para>compresses files using the Burrows-Wheeler
block sorting text compression algorithm with Huffman coding. The compression
rate is generally considerably better than that achieved by more conventional
compressors using LZ77/LZ78, like <command>gzip</command>.</para>
</listitem>
</varlistentry>

<varlistentry id="bzip2recover">
<term><command>bzip2recover</command></term>
<listitem>
<indexterm zone="ch-system-bzip2 bzip2recover"><primary sortas="b-bzip2recover">bzip2recover</primary></indexterm>
<para>tries to recover data from damaged bzipped files.</para>
</listitem>
</varlistentry>

<varlistentry id="bzless">
<term><command>bzless</command></term>
<listitem>
<indexterm zone="ch-system-bzip2 bzless"><primary sortas="b-bzless">bzless</primary></indexterm>
<para>runs <command>less</command> on bzipped files.</para>
</listitem>
</varlistentry>

<varlistentry id="bzmore">
<term><command>bzmore</command></term>
<listitem>
<indexterm zone="ch-system-bzip2 bzmore"><primary sortas="b-bzmore">bzmore</primary></indexterm>
<para>runs <command>more</command> on bzipped files.</para>
</listitem>
</varlistentry>

<varlistentry id="libbz2">
<term><filename class="libraryfile">libbz2*</filename></term>
<listitem>
<indexterm zone="ch-system-bzip2 libbz2"><primary sortas="c-libbz2*">libbz2*</primary></indexterm>
<para>is the library implementing lossless,
block-sorting data compression, using the Burrows-Wheeler algorithm.</para>
</listitem>
</varlistentry>
</variablelist>

</sect2>

</sect1>