chapter06/ed.xml


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<sect1 id="ch-system-ed" xreflabel="Ed">
<title>Installing Ed-&ed-version;</title>
<?dbhtml filename="ed.html" dir="chapter06"?>

<para>The Ed package contains a spartan line editor.</para>

<screen>&buildtime; &ed-time;
&diskspace; &ed-compsize;</screen>

&aa-ed-down;
&aa-ed-dep;

<sect2><title>&nbsp;</title><para>&nbsp;</para></sect2>

<sect2>
<title>Installation of Ed</title>

<note><para>Ed isn't something which many people use. It's installed here
because it can be used by the patch program if you encounter an ed-based patch
file. This happens rarely because diff-based patches are preferred these
days.</para></note>

<para>Ed normally uses the <emphasis>mktemp</emphasis> function to create
temporary files in <filename class="directory">/tmp</filename>, but this
function contains a vulnerability (see the section on Temporary Files in <ulink
url="http://en.tldp.org/HOWTO/Secure-Programs-HOWTO/avoid-race.html"/>). The
following patch makes Ed use <emphasis>mkstemp</emphasis> instead, which is
the recommended way to create temporary files.</para>

<para>Apply the patch:</para>

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

<para>Now prepare Ed for compilation:</para>

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

<para>The meaning of the configure option:</para>

<itemizedlist>
<listitem><para><userinput>--exec-prefix=""</userinput>: This forces the
programs to be installed into the <filename>/bin</filename> directory. Having
the programs available there is useful in the event of the
<filename>/usr</filename> partition being unavailable.</para></listitem>
</itemizedlist>

<para>Compile the package:</para>

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

<para>This package has a test suite available which can perform a number of
checks to ensure it built correctly.  Should you choose to run it, the 
following command will do so:</para>

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

<para>Install the package:</para>

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

</sect2>

&aa-ed-shortdesc;
&aa-ed-desc;

</sect1>