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

<sect2>
<title>Contents</title>

<para>
The grep package contains the egrep, fgrep and grep programs.
</para>

</sect2>

<sect2><title>Description</title>

<sect3><title>egrep</title>

<para>
egrep prints lines from files matching an extended regular expression
pattern.
</para>

</sect3>

<sect3><title>fgrep</title>

<para>
fgrep prints lines from files matching a list of fixed strings,
separated by newlines, any of which is to be matched.
</para>

</sect3>

<sect3><title>grep</title>

<para>
grep prints lines from files matching a basic regular expression
pattern.
</para>

</sect3>

</sect2>