broly

 @echo off&setlocal enabledelayedexpansion
for /f "delims=" %%i in (1.txt) do (set/a n+=1&set n!n!=%%i)
if !n! lss 1000 (echo 不足1000行 & goto lp1) else (echo 超过1000 & goto 
lp2)
:lp1
for /l %%i in (1 1 !n!) do echo !n%%i!>>2.txt
pause&exit
:lp2
set/a m=!n!-1000+1
for /l %%i in (%m% 1 !n!) do echo !n%%i!>>2.txt
pause
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broly

哪里不行了？要说清楚