lfs-book/chapter06/bzip2.xml

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<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN" "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [
  <!ENTITY % general-entities SYSTEM "../general.ent">
  %general-entities;
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<sect1 id="ch-system-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. Compressing text files with <command>bzip2</command> yields a much better
compression percentage than with the traditional <command>gzip</command>.</para>

<segmentedlist>
<segtitle>&buildtime;</segtitle>
<segtitle>&diskspace;</segtitle>
<seglistitem><seg>0.1 SBU</seg><seg>3.9 MB</seg></seglistitem>
</segmentedlist>

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

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

<para>Apply a patch to install the documentation for this package:</para>

<screen><userinput>patch -Np1 -i ../&bzip2-docs-patch;</userinput></screen>

<para>The <command>bzgrep</command> command does not escape '|' and '&amp;' in
filenames passed to it. This allows arbitrary commands to be executed with the
privileges of the user running <command>bzgrep</command>. Apply the following to
address this:</para>

<screen><userinput>patch -Np1 -i ../&bzip2-bzgrep-patch;</userinput></screen>

<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 and test the package:</para>

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

<para>If reinstalling Bzip2, perform
<userinput>rm -vf /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>Install the shared <command>bzip2</command> binary into the
<filename class="directory">/bin</filename> directory, make
some necessary symbolic links, and clean up:</para>

<screen><userinput>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>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,so]</seg></seglistitem>
</segmentedlist>

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

<varlistentry id="bunzip2">
<term><command>bunzip2</command></term>
<listitem>
<para>Decompresses bzipped files</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>Decompresses to standard output</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>Runs <command>cmp</command> on bzipped files</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>Runs <command>diff</command> on bzipped files</para>
<indexterm zone="ch-system-bzip2 bzdiff"><primary sortas="b-bzdiff">bzdiff</primary></indexterm>
</listitem>
</varlistentry>

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

<varlistentry id="bzegrep">
<term><command>bzegrep</command></term>
<listitem>
<para>Runs <command>egrep</command> on bzipped files</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>Runs <command>fgrep</command> on bzipped files</para>
<indexterm zone="ch-system-bzip2 bzfgrep"><primary sortas="b-bzfgrep">bzfgrep</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>
<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>Tries to recover data from damaged bzipped files</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>Runs <command>less</command> on bzipped files</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>Runs <command>more</command> on bzipped files</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>The library implementing lossless, block-sorting data
compression, using the Burrows-Wheeler algorithm</para>
<indexterm zone="ch-system-bzip2 libbz2"><primary sortas="c-libbz2*">libbz2*</primary></indexterm>
</listitem>
</varlistentry>
</variablelist>

</sect2>

</sect1>