awk命令从块添加和删除行 [英] Awk command to add and delete lines from a block

问题描述

我输入的文件中有块像

[abc]  
para1=123  
para2=456  
para3=111  
para4=666

[pqr]  
para1=333    
para2=765    
para3=1345    

[xyz]    
para1=888    
para2=236    

我有两个要求：

1. 添加一行块，如：添加 para4 = uiy 阻止 [PQR]


2. 要由块删除参数，例如：从块中删除 PARA2 = 236 [XYZ]

1. Add a line to a block, ex: add ‍‍‍‍‍‍‍para4=uiy to block [pqr]
2. To delete a parameter from a block, ex: delete para2=236 from block [xyz]

请帮助我，我如何与awk命令实现这一点。

Please help me how can I achieve this with awk command

推荐答案

下面是另一种解决方案。通过 RS 设置为无， AWK 适用于块。 （OSCam？）

Here is another solution. By setting RS to nothing, awk works with blocks. (OSCam?)

awk '/^\[pqr/ {$0=$0"\npara4=uiy"} /^\[xyz/ {sub(/para2=[0-9]*/,"")}1' RS= ORS="\n\n" file
[abc]
para1=123
para2=456
para3=111
para4=666

[pqr]
para1=333
para2=765
para3=1345
para4=uiy

[xyz]
para1=888

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