Powershell按文件最后修改时间删除多余文件

1. 删除目录内多余文件，目录文件个数大于$count后，按最后修改时间倒序排列，删除最旧的文件。

Sort-Object -Property LastWriteTime -Descending 按照文件的最后修改时间倒序排列

Select-Object -Skip $count 跳过开头的$count条数据，取剩余的数据

$count = 3
$filePathList = "E:MySql1",
"E:MySql2",
"E:MySql3"

foreach($filePath in $filePathList)
{
    $files = Get-ChildItem -Path $filePath | Sort-Object -Property LastWriteTime -Descending | Select-Object -Skip $count
    if ($files.count -gt 0) {
        foreach($file in $files)
        {
            Remove-Item $file.FullName -Recurse -Force
        }
    }    
}

cd D:FtpServer小平台NewJob
ls -Directory|? {$_ -like 'T*'}|del -r
cd D:webDevSmallPlatformAPI 
ls |? {$_ -like 'T*'}
$count = 1
$filePathList = "D:webDevSmallPlatformAPI"
foreach($filePath in $filePathList)
{
    $files = Get-ChildItem -Path $filePath | Sort-Object -Property LastWriteTime -Descending | Select-Object -Skip $count
    if ($files.count -gt 0) {
        foreach($file in $files)
        {
            Remove-Item $file.FullName -Recurse -Force
        }
    }    
}

2. 删除目录内所有文件修改时间超过timeOutDay的文件。

$timeOutDay = 30
$filePath = "H:DataBackupFile1",
"H:DataBackupDatabase2"

$allFile = Get-ChildItem -Path $filePath

foreach($file in $allFile)
{
    $daySpan = ((Get-Date) - $file.LastWriteTime).Days
    if ($daySpan -gt $timeOutDay)
    {
        Remove-Item $file.FullName -Recurse -Force
    }
}