中国DOS联盟

@echo off&setlocal enabledelayedexpansion
set var=abcdefghijklmnopqrstuvwxyz01234567890
for /l %%i in (0 1 35) do call:lp %%i
    set z=a
    for /f "delims=" %%i in (a.txt) do set str=%%i&set str2=&call:lp1
    pause&exit
:lp1
set str1=!str:~,1!
    if "!str1!"==" " set "str2=!str2! "
    set str2=!str2!!%str1%!&set str=!str:~1!
    if not defined str echo !str2!&goto :eof
    goto lp1
:lp
set/a n=%1+1
set !var:~%1,1!=!var:~%n%,1!