字符串过滤-怎么用脚本awk或者sed实现呢

字符串过滤-如何用脚本awk或者sed实现呢
1. http://www.baidu.com
http:www.163.com
s v http://219.223.232.98

我想获取的结果是
http://www.baidu.com
http:www.163.com
http://219.223.232.98

如何用脚本awk或者sed实现呢

C/C++ code

sed -i -e "s#.*http:#http:#g" filename



echo "1.http://www.weds.com"|sed 's/.*http/http/g'



sed 's/.*http*/http/g' test2.txt