使用awk在.CSV逗号分隔文件中添加双引号

嗨，我需要详细说明一个大的csv文件（2000万行），为每个逗号分隔的字段添加双引号。csv文件中有8个字段分隔，如下所示：

'2016-03-12','12393659','134',,'35533605',189348,9798,gmail.com;live_com.com
'2016-03-12','12390103','138',,'35438006',5133,1897,google.com
'2016-03-12','45616164','139',,'01318800',10945593,596633,facebook.com;tumblr.com;t.co
'2016-03-12','45673436','38',,'86441702',4350985,150327,serving-sys.com;chartboost.com;admarvel.com;mydas.mobi;adap.tv;cloudfront.net

如您所见，前3个字段位于单引号之间，第4个字段为空，第5个字段位于单引号之间，第6到第8个字段仅以逗号分隔。 我希望得到以下结果（第四个字段即使为空也需要双引号）：

我通过混合sed和awk部分获得结果：

sed -e s/\'//g inpu.csv > output.csv eliminate quotes
awk '{gsub(/[^,]+/,"\"&\"")}1' output.csv > output1.csv add double quotes

但是第四个字段不是双重引用的，我需要尽可能减少细化时间。 无论如何，这有助于在awk中以更好的表现和第四场双报价完成所有工作。

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谢谢你的帮助。M.Tave

试试这个awk一行：

 awk -F, -v OFS="," -v re="^'?|'?$" -v q='"' 
                  '{for(i=1;i<=NF;i++)if($i)gsub(re,q,$i);else $i=q$i q}7' file

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尝试一下这款awk one liner：

 awk -F, -v OFS="," -v re="^'?|'?$" -v q='"' 
                  '{for(i=1;i<=NF;i++)if($i)gsub(re,q,$i);else $i=q$i q}7' file

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如果您的数据真的那么简单，没有嵌入引号、换行符或任何东西，那么您只需要：

$ awk -F"'?,'?" -v OFS='","' '{$1=$1; gsub(/^.|$/,"\"")} 1' file
"2016-03-12","12393659","134","","35533605","189348","9798","gmail.com;live_com.com"
"2016-03-12","12390103","138","","35438006","5133","1897","google.com"
"2016-03-12","45616164","139","","01318800","10945593","596633","facebook.com;tumblr.com;t.co"
"2016-03-12","45673436","38","","86441702","4350985","150327","serving-sys.com;chartboost.com;admarvel.com;mydas.mobi;adap.tv;cloudfront.net"

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如果您的数据真的那么简单，没有嵌入引号、换行符或任何东西，那么您只需要：

$ awk -F"'?,'?" -v OFS='","' '{$1=$1; gsub(/^.|$/,"\"")} 1' file
"2016-03-12","12393659","134","","35533605","189348","9798","gmail.com;live_com.com"
"2016-03-12","12390103","138","","35438006","5133","1897","google.com"
"2016-03-12","45616164","139","","01318800","10945593","596633","facebook.com;tumblr.com;t.co"
"2016-03-12","45673436","38","","86441702","4350985","150327","serving-sys.com;chartboost.com;admarvel.com;mydas.mobi;adap.tv;cloudfront.net"

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像往常一样，Thanx再次发挥了巨大的作用。将使用更多的压缩代码。Thanx再次非常有效。与往常一样。将使用这个更压缩的代码。