qixiaobin0715

回复 1# yyz219
纯P试试：

@echo off
chcp 65001 >nul
set /p x=Please enter the specified line number:
set /a m=x-1
(for /f "delims=" %%i in (1.txt) do (
    if defined Line4 echo,!Line4!
    for /l %%j in (%m%,-1,1) do (
        set /a n=%%j+1
        set Line!n!=!Line%%j!
    )
    set line1=%%i
)
if defined Line4 (
    type 2.txt
    for /l %%i in (%x%,-1,1) do echo,!Line%%i!
))>3.txt
pause
复制代码

qixiaobin0715

这样可以不必理会2.txt末尾是否存在空行：

@echo off
chcp 65001>nul
set x=4
set /a m=x-1
setlocal enabledelayedexpansion
(for /f "delims=" %%i in (1.txt) do (
    if defined Line4 echo,!Line4!
    for /l %%j in (%m%,-1,1) do (
        set /a n=%%j+1
        set Line!n!=!Line%%j!
    )
    set line1=%%i
)
if defined Line4 (
    for /f "delims=" %%i in (2.txt) do echo,%%i
    for /l %%i in (%x%,-1,1) do echo,!Line%%i!
))>3.txt
pause
复制代码