code36_2.txt

《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

#!/bin/sh
FILE=ipaddrs

echo Content-type: text/plain
echo

if grep -s $REMOTE_ADDR $FILE  > /dev/null 2>&1
then
 echo Computer $REMOTE_ADDR has requested this URL previously.
else
 echo $REMOTE_ADDR >> $FILE
 echo This is the first contact from computer $REMOTE_ADDR.

fi