how to check if a specific file extension exists in a folder using powershell?

Question

I have a root directory that consists of many folders and sub folders. I need to check whether a particular file like *.sln or *.designer.vb exists in the folders or subfolders and output the result in a text file.

For Eg:

$root = "C:\Root\"
$FileType = ".sln",".designer.vb"

the text file will have result somewhat like below:

.sln ---> 2 files
.sln files path ----> 
c:\Root\Application1\subfolder1\Test.sln
c:\Root\Application2\subfolder1\Test2.sln

Any help will be highly appreciated!

Regards, Ashish

Solution 1

Try this:

function Get-ExtensionCount {
    param(
        $Root = "C:\Root\",
        $FileType = @(".sln", ".designer.vb"),
        $Outfile = "C:\Root\rootext.txt"
    )

    $output = @()

    Foreach ($type in $FileType) {
        $files = Get-ChildItem $Root -Filter *$type -Recurse | ? { !$_.PSIsContainer }
        $output += "$type ---> $($files.Count) files"
        foreach ($file in $files) {
            $output += $file.FullName
        }
    }

    $output | Set-Content $Outfile
}

I turned it into a function with your values as default parameter-values. Call it by using

Get-ExtensionCount    #for default values

Or

Get-ExtensionCount -Root "d:\test" -FileType ".txt", ".bmp" -Outfile "D:\output.txt"

Output saved to the file ex:

.txt ---> 3 files
D:\Test\as.txt
D:\Test\ddddd.txt
D:\Test\sss.txt
.bmp ---> 2 files
D:\Test\dsadsa.bmp
D:\Test\New Bitmap Image.bmp

To get the all the filecounts at the start, try:

function Get-ExtensionCount {
    param(
        $Root = "C:\Root\",
        $FileType = @(".sln", ".designer.vb"),
        $Outfile = "C:\Root\rootext.txt"
    )
    #Filecount per type
    $header = @()
    #All the filepaths    
    $filelist = @()

    Foreach ($type in $FileType) {
        $files = Get-ChildItem $Root -Filter *$type -Recurse | ? { !$_.PSIsContainer }
        $header += "$type ---> $($files.Count) files"
        foreach ($file in $files) {
            $filelist += $file.FullName
        }
    }
    #Collect to single output
    $output = @($header, $filelist)    
    $output | Set-Content $Outfile
}

Solution 2

Here's a one-liner to determine if at least one file with extension .txt or .ps1 exists in the directory $OutputPath:

(Get-ChildItem -Path $OutputPath -force | Where-Object Extension -in ('.txt','.ps1') | Measure-Object).Count

Explanation: the command tells you the number of files in the specified directory matching any of the listed extensions. You can append -ne 0 to the end, which returns true or false to be used in an if block.

Comments

[Frode F.]

Filter doesn't support array input(multiple fileext.)

[Lance U. Matthews]

Yes, just realizing that now.

[Frode F.]

You could however modify it to use if ($FileType -contains $group.Name) { ... in you foreach loop instead of the Filter

[ashish g]

Hi Graimer, Thanks for your response. After I call this function through the command prompt I get: cmdlet set-content at command pipeline pos 1. supply values for the parameters.. and the parameters are endless :(

[Frode F.]

This happends when you call exactly Get-ExtensionCount ? Did you copy the function 100%? Especially the last line. $output | Set-Content $Outfile. I think you forgot to include $Outfile at the end. Script works on PS2.0 and PS3.0. You could also try to switch the line with $output | Set-Content -Path $Outfile but it shouldn't matter.

[Lance U. Matthews]

That would work, but then Group-Object would end up processing files and creating groups that might ultimately end up being ignored. Instead, I changed the call to Get-ChildItem to retrieve all files and the filtering is now performed inside of Where-Object. I made a slight change to the format of $FileType to facilitate this.

[ashish g]

Yes.. I had missed that :-) But in the output I get .sln--->44 files , .suo ---> files.. but none show the files and file paths.

[Frode F.]

oh, sorry. forgot about one PS3.0 feature. see updated answer

[ashish g]

is there a way I can print the output in the manner where all the types of files and their counts come in first and all the file paths come in the last.. .sln--->34 files .suo--->120 files then comes the filepaths

[Frode F.]

Updated answer. See the last codesample (untested, don't have PS here). :-)

[Ste]

Best answer for me on here +1. In case anyone may want the regex version, here's that. (Get-ChildItem -Path $OutputPath -force | Where-Object Extension -match ('\.jpe?g') | Measure-Object).Count Which will match either jpeg or jpg.