[文件操作] 如何批量合并多个子文件夹里的多个txt文件并按文件夹顺序批量重命名

@echo off&setlocal ENABLEDELAYEDEXPANSION
set num=1
set 文件夹a=C:\a\
for /f "delims=" %%a in ('dir /s /b /ad "%文件夹a%" 2^>nul') do (
	set "source="
	cd /d %%a
	for /f "delims=" %%b in ('dir /b *.txt 2^>nul') do (
		set "source=!source!+%%b"
)
set source=!source:~1!
copy !source! "%文件夹a%!num!.txt"
cd 
set/anum+=1
)
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