如何刪除除週一特定日期創建的文件以外的所有文件？

Question

我有一個包含SQL完全備份和增量備份的文件夾結構，所有文件擴展名爲.bak。我只想刪除所有增量。我所有的完整備份都是在星期天創建的，所以基本上我想刪除除星期天以外的任何一天創建的所有* .bak文件。

這是如何實現的？

Answer 1

PowerShell可用於根據特定條件過濾文件，包括按星期幾進行過濾。以下塊可以教你如何實現。評論是內聯的。

# Get all files which are NOT folders, where the extention matches your required extention. Use -Recurse to do this recursively - i.e. all subfolders 
$allfiles = Get-ChildItem "G:\SQL Backups" -Recurse | where {!$_.PSIsContainer -and $_.Extension -match ".bak"} 

# Filter your file list and select objects which do NOT have the Day Of Week value equal to 0 (Which is a Sunday) 
$nonsundayfiles = $allfiles | Where-Object { !$_.CreationTime.DayOfWeek.value__ -eq 0 } 

#Iterate through all the non sunday filees and delete each one. Verbose logging to screen. 
$nonsundayfiles | ForEach-Object { 
    Write-Host "The File " $_.FullName "was created on" $_.CreationTime.DayOfWeek "and therefore is being deleted" 
    Remove-Item $_.FullName -WhatIf 
    } 

#Empty variables - useful if in PowerShell ISE 
$allfiles = @() 
$nonsundayfiles = @() 

如果你有信心，你可以在一行中做到這一切。

Get-ChildItem "G:\SQL Backups" -Recurse | where {!$_.PSIsContainer -and $_.Extension -match ".bak" -and !$_.CreationTime.DayOfWeek.value__ -eq 0} | Remove-Item -WhatIf 

如果您對最終結果滿意並且想要實際刪除文件，請刪除-WhatIf參數。