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@echo off
setlocal ENABLEDELAYEDEXPANSION
echo Search for What String ?
set /p "str="
echo.

for /f "tokens=1-2 delims= " %%a in ('f 123.txt /f:"%str%" -s -o:Ftl') do (

for /f "skip=%%b delims=" %%c in ('type "%%a"') do (
echo %%c
goto :outloop
  )

)

:outloop
pause
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f 123.txt /f:"%str%" -s -o:Ftl
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@echo off
echo Search for What String ?
set /p "str="
echo.
for /f "delims=:" %%a in ('findstr /in "%str%" 123.txt') do set n=%%a
if defined n (
   for /f "skip=%n% usebackq delims=" %%c in ("123.txt") do set "v=%%c"&goto :outloop
) else echo 搜索失败
:outloop
if defined v (echo %v%)else echo "空"
pause
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