在Powershell V4中按日期对文件夹进行分组

Question

I'm looking to archive files in a path that are older than X number of day. I have a folder with a years worth of files and the end goal is to Archive items based on the moth. So i'll have a folder for each month.

$SourcePath = "C:\users\StackoverFlow\Downloads"

$maxdays ="-30"

$CurrentDate = Get-Date

$ArchiveDate = $CurrentDate.AddDays($maxdays)

$destination = "C:\users\StackoverFlow\Desktop\Downloads.Zip"

$groups = Get-ChildItem $SourcePath | 
    Where-Object { ($_.LastWriteTime -lt $ArchiveDate) -and ($_.psIsContainer -eq $false) } | 
    group {"'{0}\{1}\{2:D2}'" -f $_.CreationTime}

ForEach ($group in $groups) {
    ForEach($file in $group.Group){
       Add-Type -assembly "system.io.compression.filesystem"
     [io.compression.zipfile]::CreateFromDirectory($SourcePath, $destination) 
    }
}

I was hoping that the RegEx would do this, but it doesn't seem to do anything..

Suggestions?

Answer 1

If you want to group them by Month and Year, make sure your format string represents just those values.

The -f operator supports standard date time formatting, so you could do:

Group-Object {"{0:MMyyyy}" -f $_.CreationTime}

To zip the grouped files into individual archives, you'll have to moved them into individual folders first:

Add-Type -assembly "system.io.compression.filesystem"

$SourcePath = "C:\users\StackoverFlow\Downloads"
$destination = "C:\users\StackoverFlow\Desktop\{0}"

$maxdays = -30
$CurrentDate = Get-Date

$ArchiveDate = $CurrentDate.AddDays($maxdays)

$groups = Get-ChildItem $SourcePath | 
    Where-Object { ($_.LastWriteTime -lt $ArchiveDate) -and ($_.psIsContainer -eq $false) } | 
    Group-Object { "{0:MMyyyy}" -f $_.CreationTime }

# Create a temporary working dir
$TmpDirPath = Join-Path $([System.IO.Path]::GetTempPath()) $([System.IO.Path]::GetRandomFileName())
$TmpDirectory = New-Item -Path $TmpDirPath -ItemType Directory 

ForEach ($group in $groups) {
    # Create a new directory for the group
    $GroupDirectory = New-Item -Path (Join-Path $TmpDirectory.FullName -ChildPath $group.Name) -ItemType Directory
    # Move files into the new directory
    $group.Group | Move-Item -Destination $GroupDirectory.FullName

    # Create the month-specific archive
    [System.IO.Compression.ZipFile]::CreateFromDirectory($GroupDirectory.FullName, ($destination -f $group.Name)) 
}

This will create a Zip archive per month.
If you want it all in one zip file, move the CreateFromDirectory call outside the loop and target the top-level temporary directory we created:

$destination = "C:\users\StackoverFlow\Desktop\Downloads.zip"
# ...
foreach ($group in $groups) {
    # Create a new directory for the group
    $GroupDirectory = New-Item -Path (Join-Path $TmpDirectory.FullName -ChildPath $group.Name) -ItemType Directory
    # Move files into the new directory
    $group.Group | Move-Item -Destination $GroupDirectory.FullName

}
[System.IO.Compression.ZipFile]::CreateFromDirectory($TmpDirectory.FullName, $destination)