用awk替换字段中最后一次出现的字符

问题描述

我正在尝试用awk替换字段中最后一次出现的字符.给出的是这样的文件:

I'm trying to replace the last occurrence of a character in a field with awk. Given is a file like this one:

John,Doe,Abc fgh 123,Abc
John,Doe,Ijk-nop 45D,Def
John,Doe,Qr s Uvw 6,Ghi

我想用逗号，"替换最后一个空格"，基本上将字段分为两部分.结果应该看起来像这样:

I want to replace the last space " " with a comma ",", basically splitting the field into two. The result is supposed to look like this:

John,Doe,Abc fgh,123,Abc
John,Doe,Ijk-nop,45D,Def
John,Doe,Qr s Uvw,6,Ghi

我尝试创建一个变量，其中包含字段中出现空格的次数

I've tried to create a variable with the number of occurrences of spaces in the field with

{var1=gsub(/ /,"",$3)}

然后将其集成到

{var2=gensub(/ /,",",var1,$4); print var2}

但是gensub的how-argument不允许数字和G/g之外的任何字符.

but the how-argument in gensub does not allow any characters besides numbers and G/g.

我在此处找到了类似的线程，但是无法使解决方案适应我的问题.

I've found a similar thread here but wasn't able to adapt the solution to my problem.

我对此还很陌生，所以我们将不胜感激！

I'm fairly new to this so any help would be appreciated!

推荐答案

对于gensub()，使用GNU awk:

With GNU awk for gensub():

$ awk 'BEGIN{FS=OFS=","} {$3=gensub(/(.*) /,"\\1,","",$3)}1' file
John,Doe,Abc fgh,123,Abc
John,Doe,Ijk-nop,45D,Def
John,Doe,Qr s Uvw,6,Ghi

获得阿诺德·罗宾斯(Arnold Robbins)的《有效的Awk编程》一书.

Get the book Effective Awk Programming by Arnold Robbins.

写得很好的问题！

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