Avoid recursively fetching specific folders in PowerShell
I have a Visual Studio solution with multiple projects. I am cleaning the bin and obj folders as part of the cleaning using the following script.
Get-ChildItem -path source -filter obj -recurse | Remove-Item -recurse
Get-ChildItem -path source -filter bin -recurse | Remove-Item -recurse
This works great. However, I have a file data folder that contains about 600,000 subfolders and it is in a folder named FILE_DATA.
The above script takes a long time because it goes through all those 600,000 folders.
I need to avoid the FILE_DATA folder when I recursively navigate and delete the bin and obj folders.
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If the FILE_DATA folder is a subfolder of the source $ (no deeper) try:
$source = "C:\Users\Frode\Desktop\test"
Get-Item -Path $source\* -Exclude "FILE_DATA" | ? {$_.PSIsContainer} | % {
Get-ChildItem -Path $_.FullName -Filter "obj" -Recurse | Remove-Item -Recurse
Get-ChildItem -Path $_.FullName -Filter "bin" -Recurse | Remove-Item -Recurse
}
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Here's a more efficient approach that does what you want - skip the subtrees you want to exclude:
function GetFiles($path = $pwd, [string[]]$exclude)
{
foreach ($item in Get-ChildItem $path)
{
if ($exclude | Where {$item -like $_}) { continue }
$item
if (Test-Path $item.FullName -PathType Container)
{
GetFiles $item.FullName $exclude
}
}
}
This code is adapted from Keith Hill's answer to this post ; my contribution is bug fixes and minor refactorings; you will find a full explanation in my answer to the same SO question.
This call should do what you want:
GetFiles -path source -exclude FILE_DATA
For an even more leisurely read, check out my article on Simple-Talk.com that discusses this and more: Practical PowerShell: Pruning Tree Files and Extending Cmdlets .
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