@echo off
set fx=*.txt
set "sx=指定字符串"
for /f "delims=" %%i in ('dir/b %fx%')do (
echo %%i
set "n="
for /f "delims=:" %%j in ('findstr/nc:"%sx%" "%%i"')do set/a n=%%j
if defined n (
call more +%%n%% "%%i">temp.yky
move temp.yky "%%i")
)
pause
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@echo off
setlocal enabledelayedexpansion
set "fx=*.txt"
set "sx=指定字符串"
for /f "delims=" %%i in ('dir /b /a-d %fx%')do (
    echo %%i
    call :CutFile "%%i"
    move "temp.yky" "%%i"
)
pause
goto :eof

:CutFile
(for /f "delims=" %%j in ('type "%~1"') do (
    echo,%%j
    set "str=%%j"
    if "!str:%sx%=!" neq "%%j" (
        goto :eof
    )
))>"temp.yky"
goto :eof
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sed -i "0,/指定字符串/!d" *.txt
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@echo off
cd /d "%~dp0"
set fx=*.txt
set "sx=!!"
for /f "delims=" %%i in ('dir /b %fx%')do (
echo %%i
set "n="
for /f "delims=:" %%j in ('findstr /nc:"%sx%" "%%i"') do set /a n=%%j
setlocal EnableDelayedExpansion
if defined n (
(
  for /L %%k in (!n!,-1,1) do (
    set input=
    set /p "input="
    echo,!input!
  )
)<"%%i" >>tmp.zxy
move /y tmp.zxy "%%i"
)
endlocal
)
pause
exit /b
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