我有错误的 csv 文件，需要添加一些引号
在
field,field2,text field with potential commas,field4,field5
field,field2,text fie,ld with pot,ential commas,field4,field5
field,field2,text field with, potential commas,field4,field5
出去
field,field2,"text field with potential commas",field4,field5
field,field2,"text fie,ld with pot,ential commas",field4,field5
field,field2,"text field with, potential commas",field4,field5
sed 's/,/,"/2' 将添加第一个引号，但是对于每一行，如何从末尾向后第二次出现？
欢迎使用 sed、awk、perl 等方法。文件有几百万行，速度值得赞赏。