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@echo off
setlocal enabledelayedexpansion
::定义要统计的字串
set "var=aaaa"
for /f "delims=" %%a in (1.txt) do (
   set "str=%%a"
   set "str=!str:~-4!"
   if "!var!"=="!str!" set /a n+=1
)
echo !var! 出现了 !n! 次
pause
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