source: chapter06/ed.xml@ 673b0d8

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  <!ENTITY % general-entities SYSTEM "../general.ent">
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<sect1 id="ch-system-ed" xreflabel="Ed">
<title>Ed-&ed-version;</title>
<?dbhtml filename="ed.html"?>

<indexterm zone="ch-system-ed"><primary sortas="a-Ed">Ed</primary></indexterm>

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

<screen>&buildtime; 0.1 SBU
&diskspace; 3.1 MB</screen>

<para>Ed installation depends on: Bash, Binutils, Coreutils, Diffutils, GCC,
Glibc, Grep, Make, Sed.</para>



<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"/>). Apply
the following patch to make Ed use <emphasis>mkstemp</emphasis> instead, a
secure way to create temporary files:</para>

<screen><userinput>patch -Np1 -i ../ed-&ed-version;-mkstemp.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>To test the results, issue:
<userinput>make check</userinput>.</para>

<para>Install the package:</para>

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

</sect2>


<sect2 id="contents-ed"><title>Contents of Ed</title>

<para><emphasis>Installed programs</emphasis>: ed and red (link to ed)</para>

</sect2>


<sect2><title>Short descriptions</title>

<indexterm zone="ch-system-ed ed"><primary sortas="b-ed">ed</primary></indexterm>
<para id="ed"><command>ed</command> is a line-oriented text editor. It can be used
to create, display, modify and otherwise manipulate text files.</para>

<indexterm zone="ch-system-ed red"><primary sortas="b-red">red</primary></indexterm>
<para id="red"><command>red</command> is a restricted ed -- it can only edit files
in the current directory and cannot execute shell commands.</para>

</sect2>



</sect1>