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<td width="90%"><font size="4" face="Verdana, Arial, Helvetica"><b>What you can do with Expect</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>When your script invokes an interactive program, by default 
				Expect intercepts all input and output (STDIN, STDOUT, and 
				STDERR). This allows Expect to search for patterns that 
				match the output of the program, and send input to the 
				spawned process to simulate user interaction. Additionally, 
				Expect can pass control of a process to a user if so 
				instructed, or take control back upon request.</p>
<p>Not only do these traits make Expect remarkably useful for 
				common administrative tasks, but it turns out that Expect is 
				quite good for building test scripts to perform I/O validation 
				during program development.</p>
<p>Finally, there's the stunningly useful program, 
				<code>autoexpect</code>. Itself an Expect script, <code>autoexpect</code> 
				monitors a command line interactive program, generating an 
				Expect script that replicates that interaction exactly. Now, 
				while that usually isn't just what's needed, it is easy to 
				take the results of several autoexpect sessions, generalize 
				the expect patterns, then cut and paste them into the desired 
				configuration. It's been written in more than one place that 
				the best learning tool for Expect is to run autoexpect and 
				play with the results.</p>
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