lfs-book/chapter06/bash.xml

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
  "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
  <!ENTITY % general-entities SYSTEM "../general.ent">
  %general-entities;
]>

<sect1 id="ch-system-bash" role="wrap">
  <?dbhtml filename="bash.html"?>

  <sect1info condition="script">
    <productname>bash</productname>
    <productnumber>&bash-version;</productnumber>
    <address>&bash-url;</address>
  </sect1info>

  <title>Bash-&bash-version;</title>

  <indexterm zone="ch-system-bash">
    <primary sortas="a-Bash">Bash</primary>
  </indexterm>

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

    <para>The Bash package contains the Bourne-Again SHell.</para>

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

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

  </sect2>

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

    <para>Incorporate some upstream fixes:</para>

<screen><userinput remap="pre">patch -Np1 -i ../&bash-fixes-patch;</userinput></screen>

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

<screen><userinput remap="configure">./configure --prefix=/usr                    \
            --docdir=/usr/share/doc/bash-&bash-version; \
            --without-bash-malloc            \
            --with-installed-readline</userinput></screen>

    <variablelist>
      <title>The meaning of the new configure option:</title>

      <varlistentry>
        <term><parameter>--with-installed-readline</parameter></term>
        <listitem>
          <para>This option tells Bash to use the <filename
          class="libraryfile">readline</filename> library that is already
          installed on the system rather than using its own readline
          version.</para>
        </listitem>
      </varlistentry>

    </variablelist>

    <para>Compile the package:</para>

<screen><userinput remap="make">make</userinput></screen>

    <para>Skip down to <quote>Install the
    package</quote> if not running the test suite.</para>

    <para>To prepare the tests, ensure that the <systemitem class="username">nobody</systemitem> user can write to the sources tree:</para>

<screen><userinput remap="test">chown -Rv nobody .</userinput></screen>

    <para>Now, run the tests as the <systemitem
    class="username">nobody</systemitem> user:</para>

<screen><userinput remap="test">su nobody -s /bin/bash &lt;&lt; EOF
PATH=$PATH HOME=/home make tests
EOF</userinput></screen>

    <para>The <command>su</command> command above is slightly different from
    other places in the book. The
    reason is that the <option>-c</option> option runs the command without
    a controlling terminal, while the bash test suite needs one.</para>

    <para>Nevertheless, the <systemitem class="username">nobody</systemitem>
    user does not have enough permissions for all the tests to pass. This shows
    up in some <quote>diff</quote> output in four test results.</para>

    <para>Install the package and move the main executable to
    <filename class='directory'>/bin</filename>:</para>

<screen><userinput remap="install">make install
mv -vf /usr/bin/bash /bin</userinput></screen>

    <para>Run the newly compiled <command>bash</command> program (replacing the one that is
    currently being executed):</para>

<screen role="nodump"><userinput>exec /bin/bash --login +h</userinput></screen>

    <note>
      <para>The parameters used make the <command>bash</command>
      process an interactive login shell and continue to disable hashing so
      that new programs are found as they become available.</para>
    </note>

  </sect2>

  <sect2 id="contents-bash" role="content">
    <title>Contents of Bash</title>

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

      <seglistitem>
        <seg>bash, bashbug, and sh (link to bash)</seg>
        <seg>/usr/include/bash, /usr/lib/bash, and
        /usr/share/doc/bash-&bash-version;</seg>
      </seglistitem>
    </segmentedlist>

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

      <varlistentry id="bash">
        <term><command>bash</command></term>
        <listitem>
          <para>A widely-used command interpreter; it performs many types of
          expansions and substitutions on a given command line before executing
          it, thus making this interpreter a powerful tool</para>
          <indexterm zone="ch-system-bash bash">
            <primary sortas="b-bash">bash</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="bashbug">
        <term><command>bashbug</command></term>
        <listitem>
          <para>A shell script to help the user compose and mail standard
          formatted bug reports concerning <command>bash</command></para>
          <indexterm zone="ch-system-bash bashbug">
            <primary sortas="b-bashbug">bashbug</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="sh">
        <term><command>sh</command></term>
        <listitem>
          <para>A symlink to the <command>bash</command> program; when invoked
          as <command>sh</command>, <command>bash</command> tries to mimic the
          startup behavior of historical versions of <command>sh</command> as
          closely as possible, while conforming to the POSIX standard as
          well</para>
          <indexterm zone="ch-system-bash sh">
            <primary sortas="b-sh">sh</primary>
          </indexterm>
        </listitem>
      </varlistentry>

    </variablelist>

  </sect2>

</sect1>