<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 mktemp 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 mkstemp instead, which is the recommended way to
create temporary files.</para>

<para>Apply the patch:</para>

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

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

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

<para>Compile the package:</para>

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

<para>Test the results:</para>

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

<para>Install the package:</para>

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

<para>And move the programs to the <filename>/bin</filename> directory, so
they can be used in the event that the <filename>/usr</filename> partition is
unavailable.</para>

<para><screen><userinput>mv /usr/bin/{ed,red} /bin</userinput></screen></para>

</sect2>