@echo off
setlocal enabledelayedexpansion
rem =======读取文件全部内容（注：没考虑特殊字符等）========
for /f "delims=" %%i in (test.txt) do (
     set "str="       %/这里清空变量str%
     for %%j in (%%i) do ( %//以空格为分割符切割变量%
         rem ===========如果%%j没有定义过，就定义，并将该变量结果传给str========
         if not defined %%j set %%j=A && set str=!str! %%j)
     echo 结果为：!str!，结果保存在文件：res.txt中....
     echo !str!>res.txt
)
          
pause>nul
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@echo off
for /f "delims=" %%a in (a.txt) do (
for %%i in (%%a) do (
if not defined %%i (set %%i=a&set /p=%%i <nul)
)
echo.
)
pause
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@echo off
cd.>a.txt
for /l %%a in (1 1 129) do set /p=%%a <nul>>a.txt
echo.>>a.txt
for /l %%a in (1 1 10) do set /p=%%a <nul>>a.txt
echo.>>a.txt
for /l %%a in (3 1 40) do set /p=%%a <nul>>a.txt
echo.>>a.txt
for /l %%a in (100 1 120) do set /p=%%a <nul>>a.txt
echo.>>a.txt
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@echo off
for /f "delims=" %%a in (a.txt) do (
  for %%b in (%%a) do set /a _%%b+=1
)
setlocal EnableDelayedExpansion
for /f "tokens=1,2 delims=_=" %%a in ('set _') do (
  if "%%b"=="1" (
  set /a num+=1
  set/p=%%a <NUL
  if !num! equ 10 set num=0&echo.
  ))
pause
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