[.net] powershell - extract file name and extension

I need to extract file name and extension from e.g. my.file.xlsx. I don't know the name of file or extension and there may be more dots in the name, so I need to search the string from the right and when I find first dot (or last from the left), extract the part on the right side and the part on the left side from that dot.

Maybe there is better solution, but I did'n find anything here or anywhere else. Thank you

This is an adaptation, if anyone is curious. I needed to test whether RoboCopy successfully copied one file to multiple servers for its integrity:

   $Comp = get-content c:\myfile.txt

ForEach ($PC in $Comp) {
    dir "\\$PC\Folder\Share\*.*" | Select-Object $_.BaseName
}

Nice and simple, and it shows the directory and the file inside it. If you want to specify one file name or extension, just replace the *'s with whatever you want.

    Directory: \\SERVER\Folder\Share

Mode                LastWriteTime     Length Name                                                                                                                                             
----                -------------     ------ ----                                                                                                                                             
-a---         2/27/2015   5:33 PM    1458935 Test.pptx                                                                                                             

PS C:\Windows\System32\WindowsPowerShell\v1.0>split-path "H:\Documents\devops\tp-mkt-SPD-38.4.10.msi" -leaf
tp-mkt-SPD-38.4.10.msi

PS C:\Windows\System32\WindowsPowerShell\v1.0> $psversiontable

Name                           Value
----                           -----
CLRVersion                     2.0.50727.5477
BuildVersion                   6.1.7601.17514
PSVersion                      2.0
WSManStackVersion              2.0
PSCompatibleVersions           {1.0, 2.0}
SerializationVersion           1.1.0.1
PSRemotingProtocolVersion      2.1

Check the BaseName and Extension properties of the FileInfo object.

As of PowerShell 6.0, Split-Path has an -Extenstion parameter. This means you can do:

$path | Split-Path -Extension

or

Split-Path -Path $path -Extension

For $path = "test.txt" both versions will return .txt, inluding the full stop.

Use Split-Path

$filePath = "C:\PS\Test.Documents\myTestFile.txt";
$fileName = (Split-Path -Path $filePath -Leaf).Split(".")[0];
$extension = (Split-Path -Path $filePath -Leaf).Split(".")[1];

PS C:\Users\joshua> $file = New-Object System.IO.FileInfo('file.type')
PS C:\Users\joshua> $file.BaseName, $file.Extension
file
.type

just do it:

$file=Get-Item "C:\temp\file.htm"
$file.Basename 
$file.Extension

If is from a text file and and presuming name file are surrounded by white spaces this is a way:

$a = get-content c:\myfile.txt

$b = $a | select-string -pattern "\s.+\..{3,4}\s" | select -ExpandProperty matches | select -ExpandProperty value

$b | % {"File name:{0} - Extension:{1}" -f $_.substring(0, $_.lastindexof('.')) , $_.substring($_.lastindexof('.'), ($_.length - $_.lastindexof('.'))) }

If is a file you can use something like this based on your needs:

$a = dir .\my.file.xlsx # or $a = get-item c:\my.file.xlsx 

$a
    Directory: Microsoft.PowerShell.Core\FileSystem::C:\ps


Mode           LastWriteTime       Length Name
----           -------------       ------ ----
-a---      25/01/10    11.51          624 my.file.xlsx


$a.BaseName
my.file
$a.Extension
.xlsx