如何使用Powershell过滤包含的文件数量的目录

Question

I am having issues finding the correct syntax I need to filter my results on only listing directories with a file count of above a specified amount (600 in my case).

This is my code so far;

$server_dir= "D:\backup"
$export_dir= "C:\support\spcount.txt"

if($server_dir)
{

      $folders = Get-ChildItem $server_dir
        $output = @()

    foreach($folder in $folders)
    {

       $fname = $folder.Name
       $fpath = $folder.FullName
       $fcount = Get-ChildItem $fpath | Measure-Object | Select-Object -Expand Count
       $obj = New-Object psobject -Property @{FolderName = $fname; FileCount = $fcount} | Format-List; 
       $output += $obj

    }
     #Output
       $output | Tee-Object -FilePath $export_dir | Format-list FileCount
}

And I am getting positive results with this, it is listing all Child Items within the backup dir however I need to filter this to only display and out too text format IF the directory contains 600 or more files.

Can anybody help me please?

I am fairly new too powershell so please pull me up if this code is not the greatest, I am forever wanting too learn.

Thanks!

Answer 1

So in short you could do something like this to get that information.

Get-ChildItem C:\temp -Directory | 
    Select Name,@{Label="Count";Expression={(Get-Childitem $_ -file -Recurse).Count}} | 
    Where-Object{$_.Count -lt 10}

Let see if we can incorporate that in your code. Your if statement is also kind of pointless. Your variable contains a non-null \\ non-zerolength string so it will always be True. You want it to work if the directory exists I imagine.

$server_dir= "D:\backup"
$export_dir= "C:\support\spcount.txt"

if(Test-Path $server_dir){
    Get-ChildItem C:\temp -Directory | 
        Select Name,@{Label="Count";Expression={(Get-Childitem $_ -file -Recurse).Count}} | 
        Where-Object{$_.Count -lt 10} |
        ConvertTo-Csv | Tee -File $export_dir | ConvertFrom-Csv  
} Else {
    Write-Warning "$server_dir does not exist."
}

Just working on getting this to file and screen with Tee just a moment.

Answer 2

I see 2 ways to do this.

Filter it in your output like this:

$output | where -property FileCount -gt 599 | # ... your code to write to the output

Or not store it in the output array if it doesn't match the condition:

if ($fcount -gt 599) {
   $obj = New-Object psobject -Property @{FolderName = $fname; FileCount = $fcount} | Format-List;
   $output += obj
}

Answer 3

I think I found the issue. It's that Format-List statement at the end of your object creation statement. It pipes the newly created object through Format-List , and thus transforms it into something else.

$obj = New-Object psobject -Property @{FolderName = $fname; FileCount = $fcount} | Format-List

So if you remove that last bit, you'll get the object you expect

$obj = New-Object psobject -Property @{FolderName = $fname; FileCount = $fcount}

So when you use the where statement to filter, you'll actually have a FileCount property to filter on. I detected it by running the $output through Get-Member which showed me it wasn't the object with the expected properties.

So basically, here's your code, including fixes:

if($server_dir)
{
    # *** Added the -directory flag, cause we don't need those pesky files ***
    $folders = Get-ChildItem $server_dir -directory
    $output = @()

    foreach($folder in $folders)
    {

       $fname = $folder.Name
       $fpath = $folder.FullName
       $fcount = Get-ChildItem $fpath | Measure-Object | Select-Object -Expand Count
       # *** Format-List was dropped here to avoid losing the objects ***
       $obj = New-Object psobject -Property @{FolderName = $fname; FileCount = $fcount}
       $output += $obj

    }

    # *** And now the filter and we're done ***
    $output | where -Property FileCount -ge 600 | Tee-Object -FilePath $export_dir | Format-list FileCount
}

Note also the -directory to get only folders with get-childitem , and the -ge 600 ( g reater than or e qual) instead of -gt 599 which is just a bit more obvious.

Remember that the Format-* statements actually transform the data passed through them. So you should only use those at the end of the pipeline to show data on screen or dump it to a file. Don't use it to transform the data you still want to work with later on.