77七

@echo off
cd /d "%~dp0"
set n=0
for /f "delims=" %%i in ('dir /b /a-d *.txt') do (
	setlocal
	call :1 "%%i"
	endlocal
)
pause & exit

	:1
	for /f "useback delims=" %%a in ("%~1") do (
		set /a n+=1
	)
	if %n% gtr 999 (
		echo [%~1]超出999行，无法处理
		exit /b
	) else if %n% gtr 99 (
		set m=10000
	) else if %n% gtr 9 (
		set m=1000
	) else (
		set m=100
	)
	(for /f "tokens=1* delims=[]" %%a in ('find /n /v "" ^<"%~1"') do (
		if "%%b" neq "" (
			set str=%%b
			set /a m+=1
			setlocal enabledelayedexpansion
			echo !m:~2! !str!
			endlocal
		) else (
			echo=
		)
	))>$
	move $ "%~1"
	exit /b
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