netbenton

@echo off&setlocal enabledelayedexpansion
(set m=
for /f "delims=" %%a in (a.txt) do (
    for %%b in (%%a) do (
        set "one=0000%%j"&set/a m+=1&set _!num:~-4!_!m!=%%j
)  )
set n=6&set str=
for /f "tokens=2 delims==" %%i in ('set _') do (
    set str=!str! !%%i
    set/a n-=1,1/n||(set n=6&echo !str!&set str=)
)
if defined str echo !str!)>b.txt
start "b.txt"

netbenton

要是用debug的话，就就应用汇编批令完成了，搞那么多次debug调用，效率太低了一点