继续百度url题目

  要求输入一个url，输出该url是首页、目录页或者其他url 
  如下形式叫做首页： 
  militia.info/ 
  www.apcnc.com.cn/ 
  http://www.cyjzs.comwww.greena888.com/ 
  www.800cool.net/ 
  http://hgh-products.my-age.net/ 
  如下形式叫做目录页： 
  thursdaythree.net/greenhouses--gas-global-green-house-warming/ 
  http://www.mw.net.tw/user/tgk5ar1r/profile/ 
  http://www.szeasy.com/food/yszt/chunjie/ 
  www.fuckingjapanese.com/Reality/ 
  
  请注意： 
  a） url有可能带http头也有可能不带 
  b）动态url（即含有"？"的url）的一律不算目录页，如： 
  www.buddhismcity.net/utility/mailit.php?l=/activity/details/3135/ 
  www.buddhismcity.net/utility/mailit.php?l=/activity/details/2449/

下面是我实现的代码：
#!/bin/bash

#echo Please input the url:
#read urls
for url in $(cat urls)
do
echo $url | sed 's/^http:\/\///g' | grep '\/' | grep -v '\/.*\/' | grep -v '\?'
a1=$?
echo $url | sed 's/^http:\/\///g' | grep '\/.*\/' | grep -v '\?'
a2=$?
echo $url | grep '\?'
a3=$?
if [ $a1 -eq 0 ]
    then
    echo "$url is index page"
elif [ $a2 -eq 0 ]
    then
    echo "$url is directory page"
else
    echo "$url is other page"
fi
done