linux - 在 BASH 脚本中使用 'awk' 将列添加到 CSV 文件的末尾

Question

如何使用变量中的字符串将列添加到 CSV 文件的末尾？

输入.csv

2012-02-29,01:00:00,Manhattan,New York,234
2012-02-29,01:00:00,Manhattan,New York,843
2012-02-29,01:00:00,Manhattan,New York,472
2012-02-29,01:00:00,Manhattan,New York,516

输出.csv

2012-02-29,01:00:00,Manhattan,New York,234,2012-02-29 16:13:00
2012-02-29,01:00:00,Manhattan,New York,843,2012-02-29 16:13:00
2012-02-29,01:00:00,Manhattan,New York,472,2012-02-29 16:13:00
2012-02-29,01:00:00,Manhattan,New York,516,2012-02-29 16:13:00

awk.sh

#!/bin/bash

awk -F"," '{$6="2012-02-29 16:13:00" OFS $6; print}' input.csv > output.csv

我上面在 awk.sh 中的尝试将字符串添加到末尾，但去除了所有逗号分隔符。

awk.sh 结果

2012-02-29 01:00:00 Manhattan New York 234 2012-02-29 16:13:00
2012-02-29 01:00:00 Manhattan New York 843 2012-02-29 16:13:00
2012-02-29 01:00:00 Manhattan New York 472 2012-02-29 16:13:00
2012-02-29 01:00:00 Manhattan New York 516 2012-02-29 16:13:00

感谢任何帮助!

更新了 awk.sh

#!/bin/bash

GAWK="/bin/gawk"
TIMESTAMP=$(date +"%F %T")
ORIG_FILE="input.csv"
NEW_FILE="output.csv"

#Append 'Create' DateTimeStamp to CSV for MySQL logging
$GAWK -v d="$TIMESTAMP" -F"," 'BEGIN {OFS = ","} {$6=d; print}' $ORIG_FILE > $NEW_FILE
rm -f $ORIG_FILE

Answer 1

您可以在 OFS(输出字段分隔符)中添加一个逗号:

awk -F"," 'BEGIN { OFS = "," } {$6="2012-02-29 16:13:00"; print}' input.csv > output.csv

输出:

2012-02-29,01:00:00,Manhatten,New York,234,2012-02-29 16:13:00
2012-02-29,01:00:00,Manhatten,New York,843,2012-02-29 16:13:00
2012-02-29,01:00:00,Manhatten,New York,472,2012-02-29 16:13:00
2012-02-29,01:00:00,Manhatten,New York,516,2012-02-29 16:13:00

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编辑 以回答 SirOracle 的评论:

来自 awk 手册页:

       -v var=val
       --assign var=val
              Assign the value val to the variable var, before execution of the program begins.  Such 
              variable values are available to the BEGIN block of an AWK program.

因此，将您的日期分配给一个 shell 变量并在 awk 中使用它:

mydate=$(date)
awk -v d="$mydate" -F"," 'BEGIN { OFS = "," } {$6=d; print}' input.csv > output.csv