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

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

<para><command>cmp</command> compares two files and reports whether or
in which bytes they differ.</para>

<para><command>diff</command> compares two files or directories and reports
which lines in the files differ.</para>

<para><command>diff3</command> compares three files line by line.</para>

<para><command>sdiff</command> merges two files and interactively outputs
the results.</para>

</sect2>