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<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
#!/usr/local/bin/expect --

# ftp-rfc &lt;rfc-number&gt;
# ftp-rfc -index

# retrieves an rfc (or the index) from uunet

exp_version -exit 5.0

if {$argc!=1} {
  send_user "usage: ftp-rfc \[#] \[-index]\n"
  exit
}

set file "rfc$argv.Z"

set timeout 60
spawn ftp ftp.uu.net
expect "Name*:"
send "anonymous\r"
expect "Password:"
send "[e-mail]\r"
expect "ftp&gt;"
send "binary\r"
expect "ftp&gt;"
send "cd inet/rfc\r"
expect "550*ftp&gt;" exit "250*ftp&gt;"
send "get $file\r"
expect "550*ftp&gt;" exit "200*226*ftp&gt;"
close
wait
send_user "\nuncompressing file - wait...\n"
exec uncompress $file
			</code>
</pre>
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<td width="90%"><font size="4" face="Verdana, Arial, Helvetica"><b>RFC retrieval with Expect</b></font></td><td width="200" align="right"><font size="1" face="Verdana, Arial, Helvetica"><nobr>   第 2 页（共5 页）</nobr></font></td>
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<font size="2" face="Verdana, Arial, Helvetica">
<p>As an introduction to Expect, examine the example on the left. 
				It is only slightly modified from the version found in the 
				example directory from a standard Expect source distribution,
				as are all of the examples in this section. Let's walk 
				through the code...</p>
<p>This program automates FTP retrieval of IETF RFC (Request For 
				Comment) documents from the UUNet archive. The first line of 
				the script invokes an Expect shell. Note that I've given the 
				full pathname to the executable. That's safest, since it's 
				hard to know the path environment of any given user. The script 
				first checks for the Expect version, then prints a usage message 
				unless the correct number of arguments is given.</p>
<p>Next, a <i>timeout</i> value is set to prevent the Expect script 
				from locking up system resources if the FTP session spawned on 
				the following line fails to connect properly. Most of the balance 
				of the script are sets of <i>expect</i> / <i>send</i> command 
				pairs. Each <i>expect</i> command waits for the specified output 
				from the spawned program (ftp, in this case), and then 
				<i>send</i>s the correct response. Note that there are two traps 
				for ftp error codes following the <i>cd</i> and get instructions. In 
				each case, the error code 550 is matched against  first, and if 
				true, then the script exits. Otherwise, following a 250 code 
				(indicating success), expect drops through into the next 
				command.</p>
<p>After the document is received, the script issues a <i>close</i> command 
				to the ftp session. The wait command holds up script processing 
				until ftp is terminated. Finally the script sends a message to the 
				user, decompresses the downloaded RFC (or rfc-index), then exits 
				by default, not explicitly.</p>
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