--sample.ps1---------------------------------------------------------------------
$logFolder = 'LOG';
#作成日の場合
Get-ChildItem $logFolder -Recurse | Where-Object{$_.CreationTime -lt (Get-Date).AddDays(-7)} | Remove-Item

#更新日の場合
Get-ChildItem $logFolder -Recurse | Where-Object{$_.LastWriteTime -lt (Get-Date).AddDays(-7)} | Remove-Item
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ps1を実行するバッチを作成する。
--do.bat-----------------------------------------------------------------------------
powershell -ExecutionPolicy RemoteSigned -File sample.ps1
pause
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