lfs-book-zh_CN/appendixa/sed-desc.xml

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

<sect2><title>Descriptions</title>

<para>Last checked against version &sed-contversion;.</para>

<sect3><title>Program file descriptions</title>

<sect4><title>sed</title>
<para>sed is a stream editor. A stream editor is used to perform basic text 
transformations on an input stream (a file or input from a
pipeline).</para></sect4>

</sect3>

</sect2>