lfs-book/chapter06/gzip.xml

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<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd" [
  <!ENTITY % general-entities SYSTEM "../general.ent">
  %general-entities;
]>
<sect1 id="ch-system-gzip" xreflabel="Gzip" role="wrap">
<title>Gzip-&gzip-version;</title>
<?dbhtml filename="gzip.html"?>

<indexterm zone="ch-system-gzip"><primary sortas="a-Gzip">Gzip</primary></indexterm>

<sect2 role="package"><title/>
<para>The Gzip package contains programs for compressing and decompressing
files.</para>

<segmentedlist>
<segtitle>&buildtime;</segtitle>
<segtitle>&diskspace;</segtitle>
<seglistitem><seg>0.1 SBU</seg><seg>2.6 MB</seg></seglistitem>
</segmentedlist>

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

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

<para>Prepare Gzip for compilation:</para>

<screen><userinput>./configure --prefix=/usr</userinput></screen>

<para>The <command>gzexe</command> script has the location of the
<command>gzip</command> binary hard-wired into it. Because we later change
the location of the binary, the following command ensures that the new
location gets placed into the script:</para>

<screen><userinput>sed -i 's%"BINDIR"%/bin%' gzexe.in</userinput></screen>

<para>Compile the package:</para>

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

<para>Install the package:</para>

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

<para>Move the programs to the <filename class="directory">/bin</filename> directory:</para>

<screen><userinput>mv /usr/bin/gzip /bin
rm /usr/bin/{gunzip,zcat}
ln -s gzip /bin/gunzip
ln -s gzip /bin/zcat
ln -s gunzip /bin/uncompress</userinput></screen>

</sect2>


<sect2 id="contents-gzip" role="content"><title>Contents of Gzip</title>

<segmentedlist>
<segtitle>Installed programs</segtitle>
<seglistitem><seg>gunzip (link to gzip), gzexe,
gzip, uncompress (link to gunzip), zcat (link to gzip), zcmp, zdiff,
zegrep, zfgrep, zforce, zgrep, zless, zmore and znew</seg></seglistitem>
</segmentedlist>

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

<varlistentry>
<term id="gunzip"><command>gunzip</command></term>
<listitem>
<indexterm zone="ch-system-gzip gunzip"><primary sortas="b-gunzip">gunzip</primary></indexterm>
<para>decompresses gzipped files.</para>
</listitem>
</varlistentry>

<varlistentry>
<term id="gzexe"><command>gzexe</command></term>
<listitem>
<indexterm zone="ch-system-gzip gzexe"><primary sortas="b-gzexe">gzexe</primary></indexterm>
<para>is used to create self-uncompressing executable files.</para>
</listitem>
</varlistentry>

<varlistentry>
<term id="gzip"><command>gzip</command></term>
<listitem>
<indexterm zone="ch-system-gzip gzip"><primary sortas="b-gzip">gzip</primary></indexterm>
<para>compresses the given files, using Lempel-Ziv (LZ77) coding.</para>
</listitem>
</varlistentry>

<varlistentry>
<term id="zcat"><command>zcat</command></term>
<listitem>
<indexterm zone="ch-system-gzip zcat"><primary sortas="b-zcat">zcat</primary></indexterm>
<para>uncompresses the given gzipped files to standard output.</para>
</listitem>
</varlistentry>

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

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

<varlistentry>
<term id="zegrep"><command>zegrep</command></term>
<listitem>
<indexterm zone="ch-system-gzip zegrep"><primary sortas="b-zegrep">zegrep</primary></indexterm>
<para>runs egrep on gzipped files.</para>
</listitem>
</varlistentry>

<varlistentry>
<term id="zfgrep"><command>zfgrep</command></term>
<listitem>
<indexterm zone="ch-system-gzip zfgrep"><primary sortas="b-zfgrep">zfgrep</primary></indexterm>
<para>runs fgrep on gzipped files.</para>
</listitem>
</varlistentry>

<varlistentry>
<term id="zforce"><command>zforce</command></term>
<listitem>
<indexterm zone="ch-system-gzip zforce"><primary sortas="b-zforce">zforce</primary></indexterm>
<para>forces a .gz extension on all given files
that are gzipped files, so that gzip will not compress them again. This can be
useful when file names were truncated during a file transfer.</para>
</listitem>
</varlistentry>

<varlistentry>
<term id="zgrep"><command>zgrep</command></term>
<listitem>
<indexterm zone="ch-system-gzip zgrep"><primary sortas="b-zgrep">zgrep</primary></indexterm>
<para>runs grep on gzipped files.</para>
</listitem>
</varlistentry>

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

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

<varlistentry>
<term id="znew"><command>znew</command></term>
<listitem>
<indexterm zone="ch-system-gzip znew"><primary sortas="b-znew">znew</primary></indexterm>
<para>re-compresses files from compress format to gzip format -- .Z to .gz.</para>
</listitem>
</varlistentry>
</variablelist>

</sect2>

</sect1>