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📁 《计算机网络与因特网》(原书第4版) 作者:Douglas Comer博士 出版社:机械工业出版社 书中例子的代码
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<HTML><HEAD><TITLE>NETBOOK - Code Sample 36_2</TITLE></HEAD><BODY BGCOLOR="#FFFFFF"><P><TABLE BORDER="0" CELLPADDING="5" CELLSPACING="0" WIDTH="600"><TR>  <TD WIDTH="112" VALIGN="TOP" BGCOLOR="#759AC4" CELLPADDING="0"><img src="../pgmatrls/sidebar.gif" width="112" height="410" usemap="#sidebar" ismap alt="" border="0" ><map name="sidebar"><area shape="rect" coords="0,325,100,364"  href="../othrpags/page22.htm" ><area shape="rect" coords="0,287,100,326"  href="../othrpags/page17.htm" ><area shape="rect" coords="0,248,100,287"  href="../othrpags/page18.htm" ><area shape="rect" coords="0,364,100,404"  href="../othrpags/code.htm" ><area shape="rect" coords="0,210,100,248"  href="../othrpags/page15.htm" ><area shape="rect" coords="0,170,100,210"  href="../othrpags/page03.htm" ><area shape="rect" coords="0,132,100,170"  href="../othrpags/page10.htm" ><area shape="rect" coords="0,93,100,132"   href="../index.htm" ><AREA SHAPE="DEFAULT" NOHREF></map>  </TD><TD WIDTH="420" VALIGN="TOP" BGCOLOR="#FFFFFF"><CENTER><H1>Code Sample 36_2</H1></CENTER><PRE>#!/bin/shFILE=ipaddrsecho Content-type: text/plainechoif grep -s $REMOTE_ADDR $FILE  &gt; /dev/null 2&gt;&1then echo Computer $REMOTE_ADDR has requested this URL previously.else echo $REMOTE_ADDR &gt;&gt; $FILE echo This is the first contact from computer $REMOTE_ADDR.fi</PRE><p><p><p><HR WIDTH=89%  ALIGN=CENTER SIZE=2><center><h2>Item information</h2></center><p><TABLE CELLSPACING="0"><TD ALIGN="LEFT" VALIGN="TOP">Caption:</TD><TD ALIGN="LEFT">Code for CGI program that stores long-term state information insection 36.10</TD><TR><TD ALIGN="LEFT">Code sample:</TD><TD ALIGN="LEFT">36_2</td><tr><TD ALIGN="LEFT">Type:</TD><TD ALIGN="LEFT">code sample</TD><TR><TD ALIGN="LEFT">Item:</TD><TD ALIGN="LEFT"><A HREF="./code36_2.txt">Code sample 36_2</A> without caption</TD><TR><TD ALIGN="LEFT">Keywords:</TD><TD ALIGN="LEFT">CGI, CGI script, long-term state</TR></TABLE></tr></TABLE></BODY></HTML>

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