合并不同文件夹中具有相同名称的文件 [英] Merge files with same name in different folders

问题描述

我是Linux的新手，我正在寻找一个命令来合并具有相同名称但来自不同文件夹的文件.像这样:

I'm new to Linux and I'm looking for a command to merge files with the same name but from different folders. like this:

folder 1, folder l1

folder 1 contains folder 2 and files 1.txt, 2.txt, 3.txt, ... 

folder 2 contains files 1.txt, 2.txt, 3.txt, ...

我要合并文件夹1和子文件夹2中的两个文本，然后将它们放入文件夹l1中.

I want to merge two texts from folder 1 and subfolder 2, then put them into folder l1.

我知道了:

    ls ./1 | while read FILE; do

        cat ./1/"$FILE" ./1/2/"$FILE" >> ./l1/"$FILE"

    done

这个似乎很好用，两个文件被合并，但是，在文件夹l1中创建了一个新的空文件2，并在shell上显示了两个警告消息:cat:./1/2:是目录cat:./1/2/2:没有这样的文件或目录

This one seems working well, two files are merged, however, a new empty file 2 is created in folder l1, and two pieces warning message on shell: cat: ./1/2: Is a directory cat: ./1/2/2: No such file or directory

我想知道有关新文件2和警告消息的说明，更重要的是如何改进命令行或新解决方案，因为我有数十个文件夹1.

I want to know explanations for new file 2 and warning message, more important how to improve the command line or new solutions because I have dozens of folder 1.

推荐答案

您的代码看起来还不错.它发出警告是因为您也尝试合并目录！您可以添加检查以跳过目录，如下面的代码:

Your code looks quite OK. It is giving warnings because you are trying to merge directories as well! You can add a check to skip over directories, like the code below:

#!/bin/bash

cd 'folder 1'
for file in *.txt; do
  [[ ! -f $file ]] && continue      # pick up only regular files

  otherfile="folder 2/$file"
  [[ ! -f $otherfile ]] && continue # skip if there is no matching file in folder 2
  cat "$file" "$otherfile" > "folder l1/$file.merged"
done

引用上面的变量很重要，以防止单词拆分.

It's important to quote the variables above to prevent word splitting.

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