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回复 1# Vidisdatadown


  

@echo off
cd /d "%~dp0"
(for /f "useback delims=" %%a in ("2.txt") do (
	echo %%a
	set /a "n+=1,1/(n%%3)" 2>nul
	if errorlevel 1 (
		set /p str=
		setlocal enabledelayedexpansion
		echo=!str!
		endlocal
		echo=
	)
)) < "1.txt" > "3.txt"
pause
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