WHY

@echo off
chcp 65001 > nul
for /f "delims=" %%i in (1.txt) do set /a n+=1
(for /f "delims=" %%i in (1.txt) do (
    set /a n-=1
    echo;%%i
    setlocal enabledelayedexpansion
    if !n!==4 (
        endlocal
        for /f "delims=" %%j in (2.txt) do echo;%%j
    ) else endlocal
)) > 3.txt
pause
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WHY

gawk "NR==FNR{a[NR]=$0}NR>FNR{b[FNR]=$0}END{n=length(a)-4;for(i in a){print a[i];if(i==n)for(j in b)print b[j]}}" 1.txt 2.txt>3.txt
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WHY

其实用 PowerShell 也还不错，没那么多弯弯绕。保存为 Test.bat运行

@echo off
set n=4
PowerShell "[Collections.ArrayList]$a=gc 1.txt -enc UTF8; $b=gc 2.txt -enc UTF8; $a.Insert($a.Count-%n%, $b); sc 3.txt $a -enc UTF8"
pause
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