77七

@echo off
cd /d "%~dp0"
for /f "useback tokens=1 delims=[]" %%a in (`find /n "bcdefg" ^<"000.txt"`) do (
	set _"%%a"=1
)
(for /f "useback tokens=1* delims=[]" %%a in (`find /n /v "" ^<"000.txt"`) do (
	if "%%b" neq "" (
		if defined m (
			set str=%%b
			setlocal enabledelayedexpansion
			if "!str:~0,3!" equ "   " (
				echo !str!
				endlocal
			) else (
				endlocal
				set m=
			)
		)
		if defined _"%%a" (
			set m=1
		)
	)
))>out.txt
pause
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77七

楼主能自行修改代码，可能只是借鉴一下思路。

setlocal enabledelayedexpansion
echo,[!num!] "%%b"
endlocal
set /a "num+=1"
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