FOR循环将每个迭代以相同的前缀分组在一行中 [英] FOR loop group each iteration with same prefix in one line

问题描述

我以一个练习中发现有趣的问题为例：合并具有相关文件名的pdf文件

I take as an example the question that I found interesting as an exercise: Merge pdf files with related filenames

在该问题中，我尝试部分成功地回答，因为它已更新了更多信息。

In the question I tried to answer with a partial success because it has updated the question with more information.

总结一下问题是包含以下内容的文件夹：

To summarize the problem is a folder containing:

123456_ABCD.pdf
123456_EFGH.pdf
123456_IJKL.pdf
111111_ABCD.pdf
111111_EFGH.pdf
222222_IJKL.pdf
222222_WXYZ.pdf

然后在命令 FOR 中，我想要得到这样的输出：

And in a command FOR I wanted to get output like this:

123456_ABCD.pdf, 123456_EFGH.pdf, 123456_IJKL.pdf
111111_ABCD.pdf, 111111_EFGH.pdf
222222_IJKL.pdf, 222222_WXYZ.pdf

这里的每一行都表示在命令 for

Each line here are supposed representing the same prefix found in the command for

这是我尝试的方法：

Here's what I tried:

@echo off
(
    copy nul 123456_ABCD.pdf
    copy nul 123456_EFGH.pdf
    copy nul 123456_IJKL.pdf
    copy nul 111111_ABCD.pdf
    copy nul 111111_EFGH.pdf
    copy nul 222222_IJKL.pdf
    copy nul 222222_WXYZ.pdf
)

setlocal enabledelayedexpansion

::    set _pdffiles=
    set _prevfiles=
    for /f "delims=" %%i in ('dir /b /a-d /o:n "??????_????.pdf"') do (
        set "files=%%nxi"
        if "!files:~0,6!" neq "!_prevfiles:~0,6!" (
            set "_prevfiles=%%i"
            set _pdffiles=!_pdffiles! "%%i"
            set "_outputpdf=%%~ni"
        ) else (
            set _prevfiles=
            set _pdffiles=
        )
        echo pdftk.exe !_pdffiles! cat output "!_outputpdf:~0,6!.pdf"
    )

但是给我输出：

pdftk.exe  "111111_ABCD.pdf" cat output "111111.pdf"
pdftk.exe  "111111_ABCD.pdf" "111111_EFGH.pdf" cat output "111111.pdf"
pdftk.exe  "111111_ABCD.pdf" "111111_EFGH.pdf" "123456_ABCD.pdf" cat output "123456.pdf"
pdftk.exe  "111111_ABCD.pdf" "111111_EFGH.pdf" "123456_ABCD.pdf" "123456_EFGH.pdf" cat output "123456.pdf"
pdftk.exe  "111111_ABCD.pdf" "111111_EFGH.pdf" "123456_ABCD.pdf" "123456_EFGH.pdf" "123456_IJKL.pdf" cat output "123456.pdf"
pdftk.exe  "111111_ABCD.pdf" "111111_EFGH.pdf" "123456_ABCD.pdf" "123456_EFGH.pdf" "123456_IJKL.pdf" "222222_IJKL.pdf" cat output "222222.pdf"
pdftk.exe  "111111_ABCD.pdf" "111111_EFGH.pdf" "123456_ABCD.pdf" "123456_EFGH.pdf" "123456_IJKL.pdf" "222222_IJKL.pdf" "222222_WXYZ.pdf" cat output "222222.pdf"

I搜索

_{ps：如果有人可以找到不错的标题建议，请：）}

推荐答案

echo off
setlocal EnableDelayedExpansion

set "list="
for /F "tokens=1,2 delims=_" %%a in ('dir /B *.pdf') do (
   if "!last!" neq "%%a" (
      if defined list echo pdftk.exe !list:~2!
      set "list="
      set "last=%%a"
   )
   set "list=!list!, %%a_%%b"
)
echo pdftk.exe !list:~2!

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