替换文本段落

Question

如何使用shell命令（SED或AWK）来替换一个段落在文件如下所示：

bala bala ba1 
balabala. 
leave me here. 

this paragraph 
yes, I'm going 
to be replaced 

The rest contains 
should not be replaced. 

更换后：

bala bala ba1 
balaba. 
leave me here. 

New contains, 
I'm replacement! 

The rest contains 
should not be replaced. 

我声明包含在变量$OLD中的原始数据，并将新数据包含在另一个变量$NEW中。

Answer 1

假设您拥有一个包含新老段落，变量在

$ echo "$old" 
this paragraph 
yes, I'm going 
to be replaced 

和

$ echo "$new" 
New contains, 
I'm replacement! 

您可以读取该文件（假设这就是所谓的infile）成猛砸变量和使用参数扩展：

$ contents=$(< infile) 
$ echo "${contents/$old/$new}" 
bala bala ba1 
balabala. 
leave me here. 

New contains, 
I'm replacement! 

The rest contains 
should not be replaced. 

要就地更改文件：

echo "${contents/$old/$new}" > infile.tmp && mv infile.tmp infile