Windows批量读取txt文件，筛选行并将其打印到另一个文件中

@echo off
setlocal enabledelayedexpansion

set "input_file=input.txt"
set "output_file=output.txt"
set "filter=keyword"

if exist "%output_file%" del "%output_file%"

for /f "usebackq delims=" %%a in ("%input_file%") do (
    echo %%a | findstr /i "%filter%" >nul
    if not errorlevel 1 (
        echo %%a >>"%output_file%"
    )
)

echo "筛选完成！"

endlocal