lfs-book/chapter06/diffutils.xml

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  "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
  <!ENTITY % general-entities SYSTEM "../general.ent">
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<sect1 id="ch-system-diffutils" role="wrap">
  <?dbhtml filename="diffutils.html"?>

  <title>Diffutils-&diffutils-version;</title>

  <indexterm zone="ch-system-diffutils">
    <primary sortas="a-Diffutils">Diffutils</primary>
  </indexterm>

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

    <para>The Diffutils package contains programs that show the differences
    between files or directories.</para>

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

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

  </sect2>

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

    <para>POSIX requires the <command>diff</command> command to treat whitespace
    characters according to the current locale. The following patch fixes the
    non-compliance issue:</para>

<screen><userinput>patch -Np1 -i ../&diffutils-i18n-patch;</userinput></screen>

    <para>The above patch will cause the Diffutils build system to attempt to
    rebuild the <filename>diff.1</filename> man page using the unavailable
    program <command>help2man</command>. The result is an unreadable man page for
    <command>diff</command>. We can avoid this by updating the timestamp on
    the file <filename>man/diff.1</filename>:</para>

<screen><userinput>touch man/diff.1</userinput></screen>

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

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

    <para>Compile the package:</para>

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

    <para>This package does not come with a test suite.</para>

    <para>Install the package:</para>

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

  </sect2>


  <sect2 id="contents-diffutils" role="content">
    <title>Contents of Diffutils</title>

    <segmentedlist>
      <segtitle>Installed programs</segtitle>

      <seglistitem>
        <seg>cmp, diff, diff3, and sdiff</seg>
      </seglistitem>
    </segmentedlist>

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

      <varlistentry id="cmp">
        <term><command>cmp</command></term>
        <listitem>
          <para>Compares two files and reports whether or in which bytes they
          differ</para>
          <indexterm zone="ch-system-diffutils cmp">
            <primary sortas="b-cmp">cmp</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="diff">
        <term><command>diff</command></term>
        <listitem>
          <para>Compares two files or directories and reports which lines in
          the files differ</para>
          <indexterm zone="ch-system-diffutils diff">
            <primary sortas="b-diff">diff</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="diff3">
        <term><command>diff3</command></term>
        <listitem>
            <para>Compares three files line by line</para>
            <indexterm zone="ch-system-diffutils diff3">
              <primary sortas="b-diff3">diff3</primary>
            </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="sdiff">
        <term><command>sdiff</command></term>
        <listitem>
          <para>Merges two files and interactively outputs the results</para>
          <indexterm zone="ch-system-diffutils sdiff">
            <primary sortas="b-sdiff">sdiff</primary>
          </indexterm>
        </listitem>
      </varlistentry>

    </variablelist>

  </sect2>

</sect1>