删除超过一年的备份文件，除当月以外的月末

Question

我正在编写一个 powershell 脚本，我需要在其中保留当月的每日备份、当年的月末备份，并删除除此之外的任何内容。

$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，这应该会删除所有不是当年的备份文件。我要解决的问题是如何删除除当月之后每个月末的备份文件之外的每日备份。我不知道如何让 -ne 到任何给定月份部分的最后一天。

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 Lee 的评论，这是我的想法。

选择 30 天滚动和月初：

$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)"
    }

}

我假设你想从脚本之日起保留 12 个月运行。

我用它来测试你的脚本：

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入输出，这是我的结果：

saved C:\temp\temp3.txt Friday, November 30, 2018 9:38:00 PM
saved C:\temp\temp.txt Thursday, February 28, 2019 9:37:59 PM
saved C:\temp\temp3.txt Wednesday, October 31, 2018 9:38:00 PM
saved C:\temp\temp4.txt Sunday, September 30, 2018 9:38:00 PM
saved C:\temp\temp4.txt Friday, August 31, 2018 9:38:00 PM
saved C:\temp\temp5.txt Tuesday, July 31, 2018 9:38:00 PM
saved C:\temp\temp6.txt Saturday, June 30, 2018 9:38:00 PM
saved C:\temp\temp6.txt Thursday, May 31, 2018 9:38:00 PM
saved C:\temp\temp7.txt Monday, April 30, 2018 9:38:01 PM
saved C:\temp\temp7.txt Saturday, March 31, 2018 9:38:01 PM
saved C:\temp\temp8.txt Wednesday, February 28, 2018 9:38:01 PM
saved C:\temp\temp6.txt Wednesday, January 31, 2018 9:38:01 PM
saved C:\temp\temp.txt Thursday, January 31, 2019 9:37:59 PM
saved C:\temp\temp.txt Monday, December 31, 2018 9:37:59 PM

删除超过一年的备份文件，除当月以外的月末

Remove backup files that are over a year and anything but the end of the month except for the current month

powershell

powershell-3.0