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@echo off&setlocal enabledelayedexpansion
for /f "tokens=1,2 delims=:" %%a in ('findstr /n . a.txt') do (
    set str=%%b
    set str=!str: =!
    for /l %%c in (0,1,100) do (
        set str2=!str:~%%c,1!
        if not "!str2!"=="" set /a "#%%a+=1"&set "_%%a=%%b"
 )
)
for /f "tokens=1,2 delims==" %%a in ('set #') do set num=!num! %%b
set num=!num:~1!
for /l %%a in (1,1,100) do (
    for %%b in (!num!) do (
	if %%a==%%b set shuzi=%%b
 )
)
for /f "tokens=1,2 delims==" %%a in ('set #') do (
	set zimu=%%a
	if %%b==!shuzi! set zimu=!zimu:~1!
)
call,echo;%%_!zimu!%%
pause
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代码有点多