[文件操作] bat中无法将ping的结果写入文件

@echo off
echo hello
pause

:p
ping www.baidu.com | findstr "TTL">>test.txt
echo errorlevel=%errorlevel%
if %errorlevel% equ 1 goto n
if %errorlevel% equ 0 goto y

:n
echo can't ping
pause
goto p

:y
echo ping ok
pause
goto p
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