循环遍历 bash 中的值对 [英] Looping over pairs of values in bash

问题描述

我有 10 个文本文件，我想粘贴每个文件及其对，这样我总共有 5 个文件.

I have 10 text files and I want to paste each file with its pair, such that I have 5 total files.

我尝试了以下方法:

for i in 4_1 5_1 6_1 7_1 8_1
do
for j in 4_2 5_2 6_2 7_2 8_2
do
paste ${i}.txt ${j}.txt > ${i}.${j}.txt
done
done

然而，这段代码结合了所有可能的组合，而不是仅仅结合匹配对.

However, this code combines every possible combination instead of just combining the matching pairs.

所以我希望文件 4_1.txt 与 4_2.txt 配对，5_1.txt 与 5_2.txt 等

So I would like file 4_1.txt to be paired with 4_2.txt, 5_1.txt with 5_2.txt, etc.

推荐答案

如果你想使用一个变量并用它执行和操作，你只需要使用一个循环:

If you want to use one variable and perform and action with it, you just need to use one loop:

for file in 4 5 6 7 8
do
   paste "${file}_1" "${file}_2"
done

这个就行了

paste 4_1 4_2
paste 5_1 5_2
...

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