@echo off
(for /f "delims=" %%a in (1.txt) do (
    endlocal
    echo;%%a
    setlocal enabledelayedexpansion
    set /p t2=
    if defined t2 echo;!t2!
))<2.txt>合并.txt
::由于可以有两个不同的输入来源并存，所以双文本合并就成为轻而易举的事了
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@echo off&setlocal enabledelayedexpansion
(for /l %%a in (1,1,50) do set /p n%%a=)<1.txt
(for /l %%a in (1,1,50) do set /p m%%a=)<2.txt
for /l %%a in (1,1,50) do (
    if not "!n%%a!"=="" echo;!n%%a!
    if not "!m%%a!"=="" echo;!m%%a!
)
pause
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@echo off & setlocal enabledelayedexpansion
cd /d %~dp0
::思路：通过行数定位结合more +n命令。
set /a nn=0
for /f "delims=" %%i in (1.txt) do (
	echo;%%i
	call :lp !nn! & set /a "nn+=1"

)
pause>nul & goto :eof


:lp
::more 第一行是以0计数开始 
for /f "delims=" %%x in ('more +%1 2.txt') do echo;%%x & goto :eof
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@echo off
set /a m=1000,n=1001
setlocal enabledelayedexpansion
for /f "delims=" %%a in (a.txt) do set /a m+=2&set #!m!=%%a
for /f "delims=" %%b in (b.txt) do set /a n+=2&set #!n!=%%b
for /f "tokens=2 delims==" %%c in ('set #') do echo %%c
pause
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