Question

我有一个Powershell脚本，正在编写，我需要在该位置保留当月的每日备份，保留当年的月底备份，并删除除此以外的任何内容。

$ThisYear = (Get-Date).year
$DailyLogs = (Get-Date).month

#Clean-Up Old Backup Files
Get-ChildItem 'D:\' | ForEach-Object {
    if ( $_.LastWriteTime.Year -gt $ThisYear) {
        Remove-Item
    }
    Elsif ( $_.LastWriteTime.Month -gt $ThisMonth -and $_.LastWriteTime.Date -ne ) {
        Remove-Item
    }

到目前为止，这应该删除今年以外的所有备份文件。我要解决的问题是如何删除除本月后每个月末的备份文件以外的每日备份。我对如何使-ne到达任何给定月份部分的最后一天感到困惑。

编辑：

#Clean-Up Old Backup Files
Get-ChildItem 'D:\Server Backup\' | ForEach-Object {
    if ( $_.LastWriteTime.Year -gt $ThisYear) {
        Remove-Item
    }
    Elsif ( $_.LastWriteTime.Month -gt $ThisMonth -and $_.LastWriteTime.Date -ne [System.DateTime]::DaysInMonth($_.LastWriteTime.Year, $($_.LastWriteTime.Month))) {
        Remove-Item
    }
}

根据李的评论，这是我的主意。

30天滚动和每月开始的替代方法：

$RollingYear = (Get-Date).AddDays(-365)
$Rolling30Days = (Get-Date).AddDays(-30)

    if ( $_.LastWriteTime.AddDays(-365) -lt $RollingYear) {
        Remove-Item
    }
    Elseif ( $_.LastWriteTime.AddDays(-30) -lt $Rolling30Days -and $_.LastWriteTime.Date -ne (Get-Date -Year $_.LastWriteTime.Year, -Month $_.LastWriteTime.Month -Day 1)) {
        Remove-Item
    }

Answer 1

我相信这就是您要寻找的：

param($Path)

$Now = (get-date)
$ThisYear = $Now.AddYears(-1).Year

#Clean-Up Old Backup Files
Get-ChildItem $path | ForEach-Object {
    if ( $_.LastWriteTime.Year -lt $ThisYear) 
    {
        write-output "-- would have deleted $($_.fullname) $($_.LastWriteTime.DateTime)"
    }
    Elseif ($_.LastWriteTime.Day -ne [System.DateTime]::DaysInMonth($_.LastWriteTime.Year, $($_.LastWriteTime.Month)))
    {
      write-output "would have deleted $($_.fullname) $($_.LastWriteTime.DateTime)"
    }
    else
    {
        Write-Output "saved $($_.FullName) $($_.LastWriteTime.DateTime)"
    }

}

我假设您想从脚本运行之日起保留12个月。

我用它来测试您的脚本：

for ($i = 1; $i -lt 500; $i++)
{ 
    new-item "$i.txt"
    (Get-ChildItem "$i.txt").lastwritetime = (get-date).AddDays(-$i)
}

我注释掉了前两个写输出，这是我的结果：

saved C:\temp\temp\103.txt Friday, November 30, 2018 9:38:00 PM
saved C:\temp\temp\13.txt Thursday, February 28, 2019 9:37:59 PM
saved C:\temp\temp\133.txt Wednesday, October 31, 2018 9:38:00 PM
saved C:\temp\temp\164.txt Sunday, September 30, 2018 9:38:00 PM
saved C:\temp\temp\194.txt Friday, August 31, 2018 9:38:00 PM
saved C:\temp\temp\225.txt Tuesday, July 31, 2018 9:38:00 PM
saved C:\temp\temp\256.txt Saturday, June 30, 2018 9:38:00 PM
saved C:\temp\temp\286.txt Thursday, May 31, 2018 9:38:00 PM
saved C:\temp\temp\317.txt Monday, April 30, 2018 9:38:01 PM
saved C:\temp\temp\347.txt Saturday, March 31, 2018 9:38:01 PM
saved C:\temp\temp\378.txt Wednesday, February 28, 2018 9:38:01 PM
saved C:\temp\temp\406.txt Wednesday, January 31, 2018 9:38:01 PM
saved C:\temp\temp\41.txt Thursday, January 31, 2019 9:37:59 PM
saved C:\temp\temp\72.txt Monday, December 31, 2018 9:37:59 PM

删除一年以上的备份文件，除当月以外的其他月份

1 个答案: