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git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@7787 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
263 lines
8.4 KiB
XML
263 lines
8.4 KiB
XML
<?xml version="1.0" encoding="ISO-8859-1"?>
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<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
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"http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [
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<!ENTITY % general-entities SYSTEM "../general.ent">
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%general-entities;
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]>
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<sect1 id="ch-system-gzip" role="wrap">
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<?dbhtml filename="gzip.html"?>
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<title>Gzip-&gzip-version;</title>
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<indexterm zone="ch-system-gzip">
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<primary sortas="a-Gzip">Gzip</primary>
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</indexterm>
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<sect2 role="package">
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<title/>
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<para>The Gzip package contains programs for compressing and decompressing
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files.</para>
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<segmentedlist>
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<segtitle>&buildtime;</segtitle>
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<segtitle>&diskspace;</segtitle>
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<seglistitem>
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<seg>&gzip-ch6-sbu;</seg>
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<seg>&gzip-ch6-du;</seg>
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</seglistitem>
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</segmentedlist>
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</sect2>
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<sect2 role="installation">
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<title>Installation of Gzip</title>
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<para>Gzip has 2 known security vulnerabilities. The following patch
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addresses both of them:</para>
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<screen><userinput>patch -Np1 -i ../&gzip-security_fix-patch;</userinput></screen>
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<para>The <command>gzexe</command> command calls <command>tail</command>
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with options that do not conform to newer versions of the POSIX standard,
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and therefore are not accepted by current versions of Coreutils. Fix this
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problem by issuing the following command:</para>
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<screen><userinput>sed -i 's/tail +/tail -n +/' gzexe.in</userinput></screen>
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<para>Prepare Gzip for compilation:</para>
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<screen><userinput>./configure --prefix=/usr</userinput></screen>
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<para>The <command>gzexe</command> script has the location of the
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<command>gzip</command> binary hard-wired into it. Because the
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location of the binary is changed later, the following command ensures
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that the new location gets placed into the script:</para>
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<screen><userinput>sed -i 's@"BINDIR"@/bin@g' gzexe.in</userinput></screen>
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<para>Compile the package:</para>
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<screen><userinput>make</userinput></screen>
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<para>This package does not come with a test suite.</para>
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<para>Install the package:</para>
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<screen><userinput>make install</userinput></screen>
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<para>Move the <command>gzip</command> program to the <filename
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class="directory">/bin</filename> directory and create some commonly used
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symlinks to it:</para>
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<screen><userinput>mv -v /usr/bin/gzip /bin
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rm -v /usr/bin/{gunzip,zcat}
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ln -sv gzip /bin/gunzip
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ln -sv gzip /bin/zcat
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ln -sv gzip /bin/compress
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ln -sv gunzip /bin/uncompress</userinput></screen>
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</sect2>
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<sect2 id="contents-gzip" role="content">
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<title>Contents of Gzip</title>
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<segmentedlist>
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<segtitle>Installed programs</segtitle>
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<seglistitem>
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<seg>compress (link to gzip), gunzip (link to gzip), gzexe, gzip,
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uncompress (link to gunzip), zcat (link to gzip), zcmp, zdiff,
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zegrep, zfgrep, zforce, zgrep, zless, zmore, and znew</seg>
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</seglistitem>
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</segmentedlist>
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<variablelist>
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<bridgehead renderas="sect3">Short Descriptions</bridgehead>
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<?dbfo list-presentation="list"?>
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<?dbhtml list-presentation="table"?>
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<varlistentry id="compress">
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<term><command>compress</command></term>
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<listitem>
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<para>Compresses and decompresses files</para>
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<indexterm zone="ch-system-gzip compress">
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<primary sortas="b-compress">compress</primary>
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</indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="gunzip">
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<term><command>gunzip</command></term>
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<listitem>
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<para>Decompresses gzipped files</para>
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<indexterm zone="ch-system-gzip gunzip">
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<primary sortas="b-gunzip">gunzip</primary>
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</indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="gzexe">
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<term><command>gzexe</command></term>
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<listitem>
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<para>Creates self-decompressing executable files</para>
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<indexterm zone="ch-system-gzip gzexe">
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<primary sortas="b-gzexe">gzexe</primary>
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</indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="gzip">
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<term><command>gzip</command></term>
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<listitem>
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<para>Compresses the given files using Lempel-Ziv (LZ77) coding</para>
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<indexterm zone="ch-system-gzip gzip">
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<primary sortas="b-gzip">gzip</primary>
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</indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="uncompress">
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<term><command>uncompress</command></term>
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<listitem>
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<para>Decompresses compressed files</para>
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<indexterm zone="ch-system-gzip uncompress">
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<primary sortas="b-uncompress">uncompress</primary>
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</indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="zcat">
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<term><command>zcat</command></term>
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<listitem>
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<para>Decompresses the given gzipped files to standard output</para>
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<indexterm zone="ch-system-gzip zcat">
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<primary sortas="b-zcat">zcat</primary>
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</indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="zcmp">
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<term><command>zcmp</command></term>
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<listitem>
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<para>Runs <command>cmp</command> on gzipped files</para>
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<indexterm zone="ch-system-gzip zcmp">
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<primary sortas="b-zcmp">zcmp</primary>
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</indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="zdiff">
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<term><command>zdiff</command></term>
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<listitem>
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<para>Runs <command>diff</command> on gzipped files</para>
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<indexterm zone="ch-system-gzip zdiff">
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<primary sortas="b-zdiff">zdiff</primary>
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</indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="zegrep">
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<term><command>zegrep</command></term>
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<listitem>
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<para>Runs <command>egrep</command> on gzipped files</para>
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<indexterm zone="ch-system-gzip zegrep">
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<primary sortas="b-zegrep">zegrep</primary>
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</indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="zfgrep">
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<term><command>zfgrep</command></term>
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<listitem>
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<para>Runs <command>fgrep</command> on gzipped files</para>
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<indexterm zone="ch-system-gzip zfgrep">
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<primary sortas="b-zfgrep">zfgrep</primary>
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</indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="zforce">
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<term><command>zforce</command></term>
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<listitem>
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<para>Forces a <filename class="extension">.gz</filename> extension on
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all given files that are gzipped files, so that <command>gzip</command>
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will not compress them again; this can be useful when file names were
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truncated during a file transfer</para>
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<indexterm zone="ch-system-gzip zforce">
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<primary sortas="b-zforce">zforce</primary>
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</indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="zgrep">
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<term><command>zgrep</command></term>
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<listitem>
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<para>Runs <command>grep</command> on gzipped files</para>
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<indexterm zone="ch-system-gzip zgrep">
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<primary sortas="b-zgrep">zgrep</primary>
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</indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="zless">
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<term><command>zless</command></term>
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<listitem>
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<para>Runs <command>less</command> on gzipped files</para>
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<indexterm zone="ch-system-gzip zless">
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<primary sortas="b-zless">zless</primary>
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</indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="zmore">
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<term><command>zmore</command></term>
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<listitem>
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<para>Runs <command>more</command> on gzipped files</para>
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<indexterm zone="ch-system-gzip zmore">
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<primary sortas="b-zmore">zmore</primary>
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</indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="znew">
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<term><command>znew</command></term>
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<listitem>
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<para>Re-compresses files from <command>compress</command> format to
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<command>gzip</command> format—<filename
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class="extension">.Z</filename> to <filename
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class="extension">.gz</filename></para>
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<indexterm zone="ch-system-gzip znew">
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<primary sortas="b-znew">znew</primary>
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</indexterm>
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</listitem>
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</varlistentry>
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</variablelist>
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</sect2>
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</sect1>
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