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<td width="90%"><font size="4" face="Verdana, Arial, Helvetica"><b>What is Expect?</b></font></td><td width="200" align="right"><font size="1" face="Verdana, Arial, Helvetica"><nobr>   第 1 页（共5 页）</nobr></font></td>
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<p>Expect is an extension of the Tcl and Tk languages. Expect 
				provides a simple, yet powerful interface for automating 
				the scripting of interactive programs. Additionally, Expect 
				makes it easy to embed interactive applications in a GUI. 
				Expect's development is coincident with the emergence of 
				Tcl/Tk, and depends on both in its current version, 5.32.</p>
<p>The author of Expect is Don Libes, who works at the US 
				National Institute of Standards and Technology (NIST). The <a href="http://expect.nist.gov" target="_blank">home page for Expect</a> is hosted on NIST 
				servers. (However, Expect and any related commercial or 
				non-commercial products are explicitly not endorsed by NIST.) 
				In the panels that follow, we'll look at a few examples of 
				Expect scripts culled from the source code example directory, 
				along with a brief overview of its command syntax.</p>
<p>Why learn something about Expect? To quote from Don's paper, 
				"Using <i>expect</i> to Automate System Administration Tasks" 
				(USENIX LISA Conference, Oct. 1990) "...the result is that the 
				UNIX system administrator's toolbox is filled with 
				representatives of some of the worst user interfaces ever seen. 
				While only a complete redesign will help all of these problems, 
				<b>expect</b> can be used to address a great many of them." </p>
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