保留每个日期的第一个文件

时间:2013-07-24 10:10:31

标签: powershell scripting powershell-v2.0 powershell-v3.0

我想在我的目录中保留最后生成的5个文件,只保留每个日期的第一个文件,因为在我的子文件夹中,我在同一天多次生成文件。

我有多个文件夹,子文件夹名为“old”

C:\test\folder1\old
C:\test\toto\old
...

例如,在我的子文件夹中,我有这个:

   Mode                LastWriteTime     Length Name                                                                                                                                                                                                                                                   
----                -------------     ------ ----                                                                                                                                                                                                                                                   

-a---        07/06/2013     12:01  231248950 geofi.ry.7.0.0.159940.zip                                                                                                                                                                                                                             
-a---        07/06/2013     12:33  231248506 geofi.ry.7.0.0.159950.zip                                                                                                                                                                                                                             
-a---        07/06/2013     14:51  231248957 geofi.ry.7.0.0.159962.zip                                                                                                                                                                                                                             
-a---        17/06/2013     19:47  231248860 geofi.ry.7.0.0.160871.zip                                                                                                                                                                                                                             
-a---        18/06/2013     11:03  231248480 geofi.ry.7.0.0.160907.zip
-a---        23/06/2013     07:30  231250266 geofi.ry.7.0.0.161571.zip                                                                                                                                                                                                                                   
-a---        23/06/2013     21:30  231250266 geofi.ry.7.0.0.161563.zip                                                                                                                                                                                                                             
-a---        04/07/2013     00:42  231249910 geofi.ry.7.0.0.162695.zip
-a---        04/07/2013     16:12  231249910 geofi.ry.7.0.0.162647.zip                                                                                                                                                                                                                                  
-a---        08/07/2013     16:10  231250481 geofi.ry.7.0.0.163046.zip                                                                                                                                                                                                                             
-a---        10/07/2013     08:40  231250476 geofi.ry.7.0.0.163378.zip                                                                                                                                                                                                                                                                                                                                                                                                                                                          
-a---        17/07/2013     10:22  231249418 geofi.ry.7.0.0.164001.zip                                                                                                                                                                                                                             

我想保留这些文件:

-a---        17/07/2013     10:22  231249418 geofi.ry.7.0.0.164001.zip
-a---        10/07/2013     08:40  231250476 geofi.ry.7.0.0.163378.zip   
-a---        08/07/2013     16:10  231250481 geofi.ry.7.0.0.163046.zip    
-a---        04/07/2013     00:42  231249910 geofi.ry.7.0.0.162695.zip (on this date i have two files, I want to keep the first generated at this date 00:42).
-a---        23/06/2013     07:30  231250266 geofi.ry.7.0.0.161571.zip (on this date i have two files, I want to keep the first generated at this date 07:30).

这是一个草案,但我被卡住了,我怎么能比较时间?

$Days = "5"

$TargetFolder = "C:\test\"

$Extension = "*.zip"

 $Files = Get-Childitem $TargetFolder -Include $Extension -Recurse | sort-object {$_.LastWriteTime} -Descending | ? { $_.fullname -match "old" } | select-object -First 1

 $most_recent_date = $files.LastWriteTime

 $LastWrite = $most_recent_date.Add(-$Days)

 $Files2 = Get-Childitem $TargetFolder -Include $Extension -Recurse | Where {$_.LastWriteTime -le "$LastWrite"}  | ? { $_.fullname -match "old" }


 foreach ($File in $Files2) 
    {
    if ($File -ne $NULL)
        {
        Remove-Item $File.FullName | out-null
        }
    else
        {
        Write-Host "No more files to delete!"
        }
    }

由于

4 个答案:

答案 0 :(得分:3)

这项工作也可以在旧的批次的帮助下完成,内置的关联数组:

@ECHO OFF &SETLOCAL ENABLEDELAYEDEXPANSION
FOR /f "delims=" %%a IN ('dir /a-d /b *.zip') DO (
    FOR /f "tokens=2-4delims=/ " %%b  IN ("%%a") DO SET "filedate=%%d%%c%%b"
    FOR /f "tokens=3" %%b IN ("%%a") DO SET "filetime=%%b"
    SET "$!filedate!$!filetime!=%%a"
)
FOR /f "delims=$" %%a IN ('set "$"') DO (
    IF NOT "%%a"=="!files!" (
        SET "file="
        FOR /f "tokens=2*delims=$=" %%b IN ('set "$%%a"') DO IF NOT DEFINED file SET "file=%%c"
        SET "#%%a=!file!"
        SET "files=%%a"
        SET /a filecount+=1
    )
)
SET /a filecount-=5
FOR /f "skip=%filecount%tokens=2delims==" %%a IN ('set "#"') DO ECHO %%a

会话协议:

>dir /a-d *.zip
-a---        07/06/2013     12:01  231248950 geofi.ry.7.0.0.159940.zip
-a---        07/06/2013     12:33  231248506 geofi.ry.7.0.0.159950.zip
-a---        07/06/2013     14:51  231248957 geofi.ry.7.0.0.159962.zip
-a---        17/06/2013     19:47  231248860 geofi.ry.7.0.0.160871.zip
-a---        18/06/2013     11:03  231248480 geofi.ry.7.0.0.160907.zip
-a---        23/06/2013     07:30  231250266 geofi.ry.7.0.0.161571.zip
-a---        23/06/2013     21:30  231250266 geofi.ry.7.0.0.161563.zip
-a---        04/07/2013     00:42  231249910 geofi.ry.7.0.0.162695.zip
-a---        04/07/2013     16:12  231249910 geofi.ry.7.0.0.162647.zip
-a---        08/07/2013     16:10  231250481 geofi.ry.7.0.0.163046.zip
-a---        10/07/2013     08:40  231250476 geofi.ry.7.0.0.163378.zip
-a---        17/07/2013     10:22  231249418 geofi.ry.7.0.0.164001.zip

>script.bat
-a---        23/06/2013     07:30  231250266 geofi.ry.7.0.0.161571.zip
-a---        04/07/2013     00:42  231249910 geofi.ry.7.0.0.162695.zip
-a---        08/07/2013     16:10  231250481 geofi.ry.7.0.0.163046.zip
-a---        10/07/2013     08:40  231250476 geofi.ry.7.0.0.163378.zip
-a---        17/07/2013     10:22  231249418 geofi.ry.7.0.0.164001.zip

答案 1 :(得分:2)

如果您想保留所有文件夹中最近5个日期的最新文件,请尝试以下操作:

$TargetFolder = 'C:\test'
$Extension    = '*.zip'

$files = gci $TargetFolder -Include $Extension -Recurse |
    ? { -not $_.PSIsContainer -and $_.Directory.Name -eq 'old' }
$keep = $files | sort LastWriteTime -Desc | group {$_.LastWriteTime.Date} |
    % {$_.Group[-1].FullName} | select -First 5
$totalSize = ($files | ? { $keep -notcontains $_.FullName } |
    Measure-Object -Sum Length).Sum
$files | ? { $keep -notcontains $_.FullName } | Remove-Item -WhatIf

"Deleted size: {0:N3}" -f ($totalSize / 1GB)

如果您想保留每个文件夹中最近5个日期的最新文件,请尝试以下操作:

$TargetFolder = 'C:\test'
$Extension    = '.zip'
$totalSize    = 0

gci $TargetFolder -Recurse | ? { $_.PSIsContainer -and $_.Name -eq 'old' } | % {
  $files = gci $_.FullName | ? { -not $_.PSIsContainer -and
      $_.Extension -eq $Extension }
  $keep = $files | sort LastWriteTime -Desc | group {$_.LastWriteTime.Date} |
      % {$_.Group[-1].FullName} | select -First 5
  $totalSize += ($files | ? { $keep -notcontains $_.FullName } |
      Measure-Object -Sum Length).Sum
  $files | ? { $keep -notcontains $_.FullName } | Remove-Item -WhatIf
}

"Deleted size: {0:N3}" -f ($totalSize / 1GB)

-WhatIf中删除Remove-Item - 切换,并在仔细检查代码确实符合您的要求后重新运行代码。

答案 2 :(得分:1)

我从您的问题中假设您只想在所有子文件夹中保留5个文件,如果是这样,下面的代码将执行您想要的操作。如果你想在每个子文件夹中保留5个文件,那么你将首先创建这些文件夹的外部循环,然后为每个单独的文件夹运行下面的代码。

$TargetFolder = "C:\test\"

$AllFiles = Get-Childitem $TargetFolder -Filter *.zip -Recurse | 
  ? { $_.fullname -match "old" -and -not $_.PSIsContainer  }

$KeepFiles = $AllFiles | 
  Sort-Object LastWriteTime | 
  Group-Object {$_.LastWriteTime.Date} | 
  % {$_.Group[0]} | 
  Sort-Object LastWriteTime -Descending |
  Select-Object -First 5

Compare-Object -ReferenceObject $AllFiles -DifferenceObject $KeepFiles -PassThru |
  Remove-Item

答案 3 :(得分:1)

这一行怎么样?

Get-Childitem $TargetFolder -Include $Extension -Recurse |Sort-Object lastwritetime -Descending | Group-Object @{Expression={($_.lastwritetime).Date}} | % {$_.group | Select-Object -Last 1}

1)获取所有文件,在这里您可以添加所需的过滤器。

2)对lastwritetime的结果进行排序。

3)按日期对结果进行分组,因此每个日期都会得到一个组。

4)获取每个日期的最后一个元素。


我忘了| Select-Object -First 5

Get-Childitem $TargetFolder -Include $Extension -Recurse |Sort-Object lastwritetime -Descending | Group-Object @{Expression={($_.lastwritetime).Date}} | % {$_.group | Select-Object -Last 1} | Select-Object -First 5

这只适用于一个目录试试这个:

Get-ChildItem $TargetFolder -Recurse | where {$_.psiscontainer} | % { Get-ChildItem -Path $_.fullname -filter $Extension |Sort-Object lastwritetime -Descending | Group-Object @{Expression={($_.lastwritetime).Date}} | % {$_.group | Select-Object -Last 1} | Select-Object -First 5}