CURL shell 使用

#! /bin/bash

requrl="http://www.baidu.com/xxxxxx"
while true
do

html=$(curl -s "$requrl")
url=$(echo "$html" | sed ‘:a;N;$!ba;s/\n//g‘ | sed ‘s/.*URL=//g‘ | sed ‘s/\].*//g‘)

  if [ ${#url} -gt 0 ];then
        doname=${url:0:20}
	myurl="http://www.baidu.com"
        if [ "$doname" = $myurl ]
	then
		requrl=$url
                echo "`date ‘+%Y-%m-%d %H:%M:%S‘` - find URL:$url" 
        else
                echo "`date ‘+%Y-%m-%d %H:%M:%S‘` - No Find URL:$url"
		break 
        fi
  fi
done