遍历在bash值对 [英] Looping over pairs of values in bash

问题描述

我有10个文本文件，我想粘贴每个文件与它配对，这样我有5个总文件。

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

我试过如下：

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

不过，这code每一个可能的组合，结合了刚刚结合匹配对吧。

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

所以我想文件 4_1.txt 与 4_2.txt ， 5_1.txt 与 5_2.txt 等

推荐答案

如果你想使用一个变量，并用它执行和行动，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

这将做

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

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