[文本处理] 批处理得知行号后如何删除该行之后的文本只显示之前的文本？

@echo off&setlocal enabledelayedexpansion
set line=4
for /f "delims=" %%i in (a.txt) do (
    set /a n+=1
    if !n!==%line% goto end
    echo %%i
)
:end
pause
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@echo off
::提取m行之前的行到2.txt
setlocal enabledelayedexpansion
set /p m=请输入行号:
set a=1
for /f  "tokens=*"  %%i in (1.txt) do if !a! lss !m! (echo %%i>>2.txt
set /a a+=1)
start 2.txt
pause
复制代码