使用awk中其他列的引用来计算列的总和 [英] Calculate sum of column using reference of other column in awk

问题描述

我有一个包含2列的文件.第一列包含一些关键字，第二列包含其大小.关键字可以重复如下:

I have a file which contains 2 column. first column contains some keyword and second contains its size. Keywords can be repeated like below:

data1 5
data2 7
data3 4
data2 6
data1 3
data2 8

我想计算与相同关键字绑定的大小之和.

I want to calculate sum of sizes which are bound with same keyword.

例如，上述数据的输出为:

For example output of above data will be:

data1 8
data2 21
data3 4

可以使用awk吗?

如果是，那么请指导我.

If yes then kindly guide me.

推荐答案

您可以对数组执行awk:

awk '{a[$1]+=$2} END {for (i in a) print i,a[i]}' file
data1 8
data2 21
data3 4

工作原理 a[$1]使用字段#1作为参考的名为a的创建数组.
a[$1]+=$2等同于a[$1]=a[$1]+$2将字段#2的值添加到数组a[$1]
for (i in a)循环遍历数组a[$1]
中的所有值 print i,a[i]打印数组i和数组a[i]

How it works a[$1] this create array named a using field #1 as reference.
a[$1]+=$2 is the same as a[$1]=a[$1]+$2 add value of field #2 to the array a[$1]
for (i in a) loop trough all value in array a[$1]
print i,a[i] prints the array i and the value of array a[i]

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