Shell extract broken URL's

Question

我是shell腳本編程新手。我通過python從郵件中提取了一些URL，但腳本解碼的URL被破壞了。所以我認爲是編寫一個代碼，以便我只能提取所需的URL。

以下是文件：

http://stackoverflow.com/questions/17988756/= 
how-to-select-lines-between-two-marker-patterns-which-may-occur-multiple-times-w 
. 
. 
.(some text) 
http://stackoverflow.com/questions/9605232/= 
merge-two-lines-into-one 
. 
. 
. 

所需的輸出是：

http://stackoverflow.com/questions/17988756/how-to-select-lines-between-two-marker-patterns-which-may-occur-multiple-times-w 
http://stackoverflow.com/questions/9605232/merge-two-lines-into-one 

在此先感謝。

Answer 1

使用此sed：

sed ':loop; /^http:.*=$/{N;s/=\n//g; t loop}' file 

測試：

$ cat file 
(some text) 
http://stackoverflow.com/questions/9605232/= 
merge-two-lines= 
-into-one 
(some text) 

$ sed ':loop; /^http:.*=$/{N;s/=\n//; t loop}' file 
(some text) 
http://stackoverflow.com/questions/9605232/merge-two-lines-into-one 
(some text)