获取特定子文件夹中的文件列表

Question

I am trying with no success to get a list of files in a .csv (and relative properties) recursevely just in one subfolders. This is my situation:

Root
|
| - Folder 1
|   | - xxxxxx
|   | - yyyyyyy
|   | - INTERESTED_FOLDER  (that contains files requested)
|
| - ...
|
| - Folder n:
    | - xxxxxx
    | - yyyyyy
    | - INTERESTED_FOLDER (that contains files requested)

Examples I found on web talk about getting all files names in ALL subdirectories, when I'd need to search just in one but iterate for all root folders 1-n. Thanks for your help.

Answer 1

You can use the Get-ChildItem cmdlet to first retrieve all Folders 1-n , than you call it again and filter the INTERESTED_FOLDER and finally call it another time to retrieve all items within that and export the csv:

Get-ChildItem | ? { $_.PSIsContainer } | 
    Get-ChildItem -Filter 'INTERESTED_FOLDER' | ? { $_.PSIsContainer } | 
        Get-ChildItem -Recurse |
            Export-Csv -Path c:\content.csv

Answer 2

Grab all the INTERESTED_FOLDERs in one go using the -Include parameter, then get the contents of all of them.

If you use Where-Object then PowerShell retrieves all items then filters them, which takes longer and may be significant if you have a lot of items (you can assess the difference by including your code block in a Measure-Object statement). Always try and use the native provider's filtering capabilities as this will reduce execution time. If you are using PowerShell v3 or above there are additional arguments for files or folders available in Get-ChildItem:

Get-ChildItem -Path $Path -Recurse -Directory -Include 'INTERESTED_FOLDER','INTERESTED_FOLDER1' |
Foreach-Object {Get-ChildItem $_ -File} |
Export-Csv -Path $OutPutFile -NoTypeInformation