source: postlfs/shells/dash.xml

<?xml version="1.0" encoding="UTF-8"?>
<!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;

  <!ENTITY dash-download-http "http://gondor.apana.org.au/~herbert/dash/files/dash-&dash-version;.tar.gz">
  <!ENTITY dash-download-ftp  " ">
  <!ENTITY dash-md5sum        "57222b768b84003ea4b801e5d5e0e52b">
  <!ENTITY dash-size          "244 KB">
  <!ENTITY dash-buildsize     "2.9 MB">
  <!ENTITY dash-time          "less than 0.1 SBU">
]>

<sect1 id="dash" xreflabel="Dash-&dash-version;">
  <?dbhtml filename="dash.html"?>


  <title>Dash-&dash-version;</title>

  <indexterm zone="dash">
    <primary sortas="a-Dash">Dash</primary>
  </indexterm>

  <sect2 role="package">
    <title>Introduction to Dash</title>

    <para>
      <application>Dash</application> is a POSIX compliant shell. It can be
      installed as /bin/sh or as the default shell for either <systemitem
      class="username">root</systemitem> or a second user with a userid of 0.
      It depends on fewer libraries than the <application>Bash</application>
      shell and is therefore less likely to be affected by an upgrade problem
      or disk failure. <application>Dash</application> is also useful for
      checking that a script is completely compatible with POSIX syntax.
    </para>

    &lfs121_checked;

    <bridgehead renderas="sect3">Package Information</bridgehead>
    <itemizedlist spacing="compact">
      <listitem>
        <para>
          Download (HTTP): <ulink url="&dash-download-http;"/>
        </para>
      </listitem>
      <listitem>
        <para>
          Download (FTP): <ulink url="&dash-download-ftp;"/>
        </para>
      </listitem>
      <listitem>
        <para>
          Download MD5 sum: &dash-md5sum;
        </para>
      </listitem>
      <listitem>
        <para>
          Download size: &dash-size;
        </para>
      </listitem>
      <listitem>
        <para>
          Estimated disk space required: &dash-buildsize;
        </para>
      </listitem>
      <listitem>
        <para>
          Estimated build time: &dash-time;
        </para>
      </listitem>
    </itemizedlist>

    <bridgehead renderas="sect3">Dash Dependencies</bridgehead>

    <bridgehead renderas="sect4">Optional</bridgehead>
    <para role="optional">
      <ulink url="https://www.thrysoee.dk/editline/">libedit</ulink>
      (command line editor library)
    </para>


  </sect2>

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

    <para>
      Install <application>Dash</application> by running the following
      commands:
    </para>

<screen><userinput>./configure --bindir=/bin --mandir=/usr/share/man &amp;&amp;
make</userinput></screen>

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

    <para>
      Now, as the <systemitem class="username">root</systemitem> user:
    </para>

<screen role="root"><userinput>make install</userinput></screen>

    <para>
      If you would like to make <command>dash</command> the default
      <command>sh</command>, recreate the <filename>/bin/sh</filename>
      symlink as the <systemitem class="username">root</systemitem> user:
    </para>

    <note>
      <para>
        If you create the symbolic link from <command>dash</command>
        to  <command>sh</command>, you will need to reset the link to
        <command>bash</command> to build LFS.
      </para>
    </note>

<screen role="nodump"><userinput>ln -svf dash /bin/sh</userinput></screen>

  </sect2>

  <sect2 role="commands">
    <title>Command Explanations</title>

    <para>
      <parameter>--bindir=/bin</parameter>: This parameter places the
      <command>dash</command> binary into the root filesystem.
    </para>

    <para>
      <option>--with-libedit</option>: To compile
      <application>Dash</application> with libedit support.
    </para>

  </sect2>

  <sect2 role="configuration">
    <title>Configuring Dash</title>

    <sect3 id="dash-config">
      <title>Config Files</title>

      <para>
        <application>Dash</application> sources
        <filename>/etc/profile</filename> and
        <filename>~/.profile</filename>
      </para>

      <indexterm zone="dash dash-config">
        <primary sortas="e-etc-profile">/etc/profile</primary>
      </indexterm>

      <indexterm zone="dash dash-config">
        <primary sortas="e-AA.profile">~/.profile</primary>
      </indexterm>

    </sect3>

    <sect3>
      <title>Configuration Information</title>

      <para>
        Update <filename>/etc/shells</filename> to include the
        <application>Dash</application> shell by issuing the following command
        as the <systemitem class="username">root</systemitem> user:
      </para>

<screen role="root"><userinput>cat &gt;&gt; /etc/shells &lt;&lt; "EOF"
<literal>/bin/dash</literal>
EOF</userinput></screen>

    </sect3>

  </sect2>

  <sect2 role="content">
    <title>Contents</title>

    <segmentedlist>
      <segtitle>Installed Program</segtitle>
      <segtitle>Installed Libraries</segtitle>
      <segtitle>Installed Directories</segtitle>

      <seglistitem>
        <seg>dash</seg>
        <seg>None</seg>
        <seg>None</seg>
      </seglistitem>
    </segmentedlist>

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

      <varlistentry id="dash-prog">
        <term><command>dash</command></term>
        <listitem>
          <para>
            is a POSIX compliant shell
          </para>
          <indexterm zone="dash dash-prog">
            <primary sortas="b-dash">dash</primary>
          </indexterm>
        </listitem>
      </varlistentry>

    </variablelist>

  </sect2>

</sect1>