601997526

@echo off
setlocal enabledelayedexpansion
set n=10000
(for /f "delims=" %%a in (a.txt) do (
    set /a n+=1
    echo.!n:~-4!  %%a
))>b.txt
复制代码

之前这个是复制4楼的,少写了一对括号,已修正