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<td width="90%"><font size="4" face="Verdana, Arial, Helvetica"><b>使用 Expect 可以完成哪些任务？</b></font></td><td width="200" align="right"><font size="1" face="Verdana, Arial, Helvetica"><nobr>   第 5 页（共5 页）</nobr></font></td>
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<p>当脚本调用交互式程序时，缺省情况下，Expect 拦截所有输入和输出（STDIN、STDOUT 和	STDERR）。这允许 Expect 搜索与程序输出匹配的模式，并将输入发送到产生的进程，以模拟用户交互。另外，Expect 可以将进程的控制传递给用户（如果这样指示的话），或者根据请求控制。</p>
<p>这些特性不仅使 Expect 对于公共管理任务变得非常有用，而且证实了 Expect 有益于构建测试脚本，以在程序开发期间执行 I/O 验证。</p>
<p>最后，有一个极其有用的程序 <code>autoexpect</code>。它本身是一个 Expect 脚本，<code>autoexpect</code> 监控命令行交互式程序，生成精确复制该交互的	Expect 脚本。现在，虽然通常不需要它，但很容易拿几个 autoexpect 会话的结果，概括 expect 模式，然后将它们剪贴到期望的配置中。已经在多处提到过，学习 Expect 的最佳工具是运行 autoexpect 并使用这些结果。</p>
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