[文本处理] 如何用ＤＯＳ命令批量 删除 TXT 的第10行和11行

@echo off&setlocal enabledelayedexpansion
set "SourDir=E:\DCOPY\test"

cd /d "%SourDir%"
for /f  "delims=" %%a in ('dir /a-d /s /b "%SourDir%\*.txt"') do (
	set/a n=0
	for /f  "delims=" %%i in ('findstr /n ".*" "%%a"') do (
       set/a n+=1
        if not !n!==10 (if not !n!==11 (
			set "var=%%i"&&set var=!var:*:=!
			echo.!var!
		))
	)
)>"%%a.log"
pause&exit
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@echo off&setlocal EnableDelayedExpansion
set n=1
for /f "delims=" %%a in (1.txt) do (
    if "!n!" neq "10" if "!n!" neq "11" echo %%a>>2.txt
    set /a n=!n!+1
)
pause
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