Question

我有2个csv文件

文件1包含

product_id, category_id, price
pid01,cat01,10
pid02,cat01,10
pid03,cat01,20
pid04,cat02,30
pid05,cat02,20
pid06,cat03,30

文件2包含

category_id, category_name
cat01,Mouse
cat02,Cat
cat03,Fish
cat04,Dog

我需要这样的结果

product_id, category_id, category_name, price
pid01,cat01,Mouse,10
pid02,cat01,Mouse,10
pid03,cat01,Mouse,20
pid04,cat02,Cat,30
pid05,cat02,Cat,20
pid06,cat03,Fish,30

或

product_id, category_name, price
pid01,Mouse,10
pid02,Mouse,10
pid03,Mouse,20
pid04,Cat,30
pid05,Cat,20
pid06,Fish,30

我如何在Bash或Awk中实现它？

Answer 1

加入：

join --header -t , -1 2 -2 1 -o 1.1,1.2,2.2,1.3 file1 file2

输出：

pid01,cat01,Mouse,10
pid02,cat01,Mouse,10
pid03,cat01,Mouse,20
pid04,cat02,Cat,30
pid05,cat02,Cat,20
pid06,cat03,Fish,30

Answer 2

您可以像这样创建一个shell脚本（process_csv.sh）：

#!/bin/sh

data=`cat file1.csv | sed -n '/pid/,$ p'`
data2=`cat file2.csv`
echo "product_id, category_id, price, category_name" > final.csv
#since category_id is common in both files, we lookup category names based on that id.
for row in $data
            do
                    cat_id=`printf $row | awk -F "," '{print $2'}`
                    category_name=`printf "$data2" | grep "$cat_id" | cut -f2 -d','`
                    #now we write category_name to file and append it to row/line with corresponding product_id
                    echo $row","$categor_name >> final.csv


            done

只需运行“./process_csv.sh”，final.csv文件将包含结果

awk搜索并附加其他csv文件中的匹配名称

2 个答案: