中国DOS联盟

@echo off
setlocal enabledelayedexpansion
set RowNum=0
>"b.txt" echo 000~050
for /f "usebackq delims=" %%a in ("a.txt") do (
  set /a RowNum+=1
  >>"b.txt" echo %%a
  set /a mod=RowNum%%50
  if !mod! equ 0 (
    set /a BgnNum=RowNum+1
    set BgnTmp=100!BgnNum!
    set BgnTmp=!BgnTmp:~-3!
    set /a EndNum=RowNum+50
    set EndTmp=100!EndNum!
    set EndTmp=!EndTmp:~-3!
    >>"b.txt" echo !BgnTmp!~!EndTmp!
  )
)
move /y "b.txt" "a.txt"

@echo off&setlocal enabledelayedexpansion
for /f "delims=" %%i in ('type a.txt') do (
     set /a n+=1,m=n+49,v=n%%50
     if !n! equ 1 (
        echo 001~050>a.txt
        ) else (
        if !v! equ 1 echo !n!~!m!>>a.txt
      )
      echo %%i>>a.txt
)
start a.txt