Question

我有两个csv文件，如下所示：

name,Direction,Date
abc,sent,Jan 21 2014 02:06 
xyz,sent,Nov 21 2014 01:09
pqr,sent,Oct 21 2014 03:06

和

name,Direction,Date
abc,received,Jan 22 2014 02:06
xyz,received,Nov 22 2014 02:06

我根据第一列合并这两个文件并创建合并文件。我用于所需输出的两个命令是：

awk -F, -v OFS="," 'BEGIN{print "name,Direction,Date,currentDirection,receivedDate"} NR==FNR&&NR>1{a[$1]=$0;next} FNR>1{printf "%s%s\n",$0,($1 in a?FS a[$1]:"")}' 2.csv 1.csv

join -1 1 -2 1 -t, -a 1  1.csv 2.csv | sed "s/Direction,Date/currentDirection,receivedDate/2"

这两个命令都给我以下输出：

name,Direction,Date,currentDirection,receivedDate
abc,sent,Jan 21 2014 02:06,received,Jan 22 2014 02:06
xyz,sent,Nov 21 2014 01:09,received,Nov 22 2014 02:06
pqr,sent,Oct 21 2014 03:06

但是，我想，（逗号）放在空（不匹配的数据）位置，输出应该是这样的：

name,Direction,Date,currentDirection,receivedDate
abc,sent,Jan 21 2014 02:06,received,Jan 22 2014 02:06
xyz,sent,Nov 21 2014 01:09,received,Nov 22 2014 02:06
pqr,sent,Oct 21 2014 03:06,,

请注意第三行中日期后的逗号。这是我的java应用程序读取新的csv文件所必需的。有人可以建议我在这里缺少什么吗？

Answer 1

更改awk单行（看起来像我的代码......）

awk ...... FNR>1{printf "%s%s\n",$0,($1 in a?FS a[$1]:",,") ....

实际上，将""更改为",,"

unix awk命令没有为csv文件中的空值添加逗号

1 个答案: