Powershell保留最后31个文件 [英] powershell keep last 31 files

问题描述

我正在使用此powershell命令仅保留31天的备份文件.

I'm using this powershell command to keep only backup files that are 31 days old.

Get-ChildItem –Path  "d:\Backup\hl" –Recurse | Where-Object{$_.LastWriteTime –lt (Get-Date).AddDays(-31)} | Remove-Item -Force -Recurse

我的问题是，如果每日备份是否失败，并且例如在一个月后检查了备份文件夹，则Powershell脚本将删除全部或大部分备份，因为它们的日期早于31天.

My question is if the daily backup was to fail and I checked the backup folder e.g after a month, the powershell script would delete all or most of the backups because they are older then 31 days.

是否可以根据lastwritetime更改powershell命令以保留最后31个文件，但不是因为它们存在31天之内?

Is it possible to change the powershell command to keep the last 31 files depending on lastwritetime , but not because they are within 31 days old?

谢谢

推荐答案

按LastWriteTime排序，然后跳过前31个文件.使用-Recurse时，文件夹名称也将出现在结果中.因此，要保留最后31个文件，您需要使用Where-Object排除文件夹项，例如:

Sort by LastWriteTime and skip the first 31 files. When using -Recurse, foldernames would also appear in the result. So to keep the last 31 FILES, you need to exclude the folder-items using Where-Object, like:

Get-ChildItem –Path  "d:\Backup\hl" –Recurse |
Where-Object { !$_.PSIsContainer } |
Sort-Object LastWriteTime -Descending |
Select-Object -Skip 31 |
Remove-Item -Force -Recurse

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