Find the logged on users on a remote system/s

Does your script tells you that User is logged in as Local or Remote. and how do I know how many users are logged in to my servers

This particular script shows users who have running processes on the system, including service accounts that are running services.

Instead you likely want to use this other script that I link to:
https://gallery.technet.microsoft.com/scriptcenter/Find-the-logged-on-users-1161bd92 

That one shows just the Explorer.exe process.

Also you would likely want to make a small modification to the script, to add the SessionID.

The sessionID works a little differently in different operating systems, however I *think* only sessionid 0 or 1 can be local.

$Processinfo | ForEach-Object {  
                        New-Object PSObject -Property @{ 
                            ComputerName=$Computer 
                            LoggedOn    =$_.GetOwner().User 
                            SID         =$_.GetOwnerSid().sid} 
                            SessionId   =$_.SessionId} |  
                    Select-Object ComputerName,LoggedOn,SID,SessionId 

What I recommend is actually using the PSterminalsservices module, that has some cmdlets for managing Terminal Services.

    # Get-TSSession is from @ShayLevy 
    # http://archive.msdn.microsoft.com/PSTerminalServices

I am new to powershell, how do you runt the script

Here are some instructions that I had posted earlier down the page . ..

step 1) Download the file and save it to a known location.
step 2) right click on the script, select properties, then unblock.
step 3) Open the powershell console (running as Administrator/elevated)
step 4) dot source the file/function into memory:
. c:\fullpath\Get-LoggedOnUsers.ps1
That is dot, then a space, then the full path to the file, then press enter.
step 5) see if the function is loaded: Get-item function:\Get-LoggedOnUser
         or get-command Get-Loggedonuser
step 6) call the function via: Get-LoggedOnUser -computername server123

Thank you!
I added a counter to count the number of detected users.

.........
 $Computer = $_ 
	$Count = 0
    try 
........

ForEach-Object { $Count++;New-Object psobject -Property @{Computer=$Computer;LoggedOn=$_} } |  
........
}#Forech-object(Comptuters)        
     IF($Count -le 0){
	 	"No Logged in Users found" | Out-Host
	}

This gives me an output if nobody is logged in

Great script, but it was running quite slow. I modified to find logged on user on hundreds of computers, so couldn't take the slowness, then I had an idea, limit the Win32_process query to 'explorer.exe', and it helped a lot! About 4 times faster.

Changed this line:
$processinfo = @(Get-WmiObject -class win32_process -ComputerName $Computer -EA "Stop") 

To:
$processinfo = @(Get-WmiObject -class win32_process -ComputerName $Computer -Filter "Name='explorer.exe'" -EA "Stop") 

NB. You will also get accounts running services with this query.
You can use the following script to only get users running the Explorer.exe process
http://gallery.technet.microsoft.com/scriptcenter/Find-the-logged-on-users-1161bd92

When I run your function, I get no output, not even the error about "no processes running." Also, on your note to another user you gave the wrong syntax, you said to use "Get-LoggedOnUser -ComputerName ServerName" - but you don't have a "-ComputerName" qualifier. Should be "Get-LoggedOnUser ServerName".
Either way, from my "domain admin" PS prompt (so you know there's no permission issue), Get-WmiObject -class win32_process -ComputerName "RemoteServer" works perfectly! And yet, when I execute "Get-LoggedOnUser RemoteServer" - I get no errors, no messages, NO output whatsoever, from the exact same elevated (domain admin) session. What gives? I am on Server 2008 R2, with PS 2.0, full privs. Now, I did NOT "cut and paste" your script - I grabbed it via the "Download" button, in case there's a difference - maybe that's the issue? Maybe something wasn't corrected in the downloadable version? Haven't yet tested the 'cut-n-paste' version that is listed on the page here. Thanks.

I did some stub-testing: I placed a "Write-Host" just above the word 'function,' and that produces output just fine; but then, it's like, no matter what you enter as a parameter, it 'falls through' (bypasses) the entire function, and gives no output.
So, what am I doing wrong? Basically, from within PS, I do: 
.\Get-LoggedOnUser.ps1 RemoteServerName

Same here - I get no output on a system with PS 3.0 and PS 4.0.  I wonder if this will only work on a 2.0 system.

step 1) Download the file and save it to a known location.
step 2) right click on the script, select properties, then unblock.
step 3) Open the powershell console (running as Administrator/elevated)
step 4) dot source the file/function into memory:   * you missed this step.
. c:\fullpath\Get-LoggedOnUsers.ps1
That is dot, then a space, then the full path to the file, then press enter.
step 5) see if the function is loaded: Get-item function:\Get-LoggedOnUser
         or get-command Get-Loggedonuser
step 6) call the function via: Get-LoggedOnUser -computername server123

GREAT SCRIPT! Not a question, but if you are working with SharePoint here is a slightly modified version to check all Farm members.

#Add SharePoint PSSnapin if it not already loaded:
$ver = $host | select version 
if ($ver.Version.Major -gt 1) {$Host.Runspace.ThreadOptions = "ReuseThread"} 
if((Get-PSSnapin -Name microsoft.sharepoint.powershell -EA "SilentlyContinue") -eq $null){
	Add-PsSnapin microsoft.sharepoint.powershell;
} Clear-Host

function Get-LoggedOnUser { 
#Requires -Version 2.0             
[CmdletBinding()]             
Param (                        
	[Parameter(Mandatory=$true, 
	   Position=0,                           
	   ValueFromPipeline=$true,             
	   ValueFromPipelineByPropertyName=$true)]          
	[String[]]$ComputerName 
)#End Param 
 
Begin {             
	Write-Host "`n Checking Users . . . " 
	$i = 0             
}#Begin     
Process { 
    $ComputerName | Foreach-object { 
    $Computer = $_ 
    try { 
		$processinfo = @(Get-WmiObject -class win32_process -ComputerName $Computer -EA "Stop") 
		if ($processinfo){     
			$processinfo | Foreach-Object {$_.GetOwner().User} |  
			Where-Object {$_ -ne "NETWORK SERVICE" -and $_ -ne "LOCAL SERVICE" -and $_ -ne "SYSTEM"} | 
			Sort-Object -Unique | 
			ForEach-Object { New-Object psobject -Property @{Computer=$Computer;LoggedOn=$_} } |  
			Select-Object Computer,LoggedOn 
		}
	} catch { 
		"Cannot find any processes running on $computer" | Out-Host 
	} }#Forech-object(Comptuters)        
}#Process 
End {}#End 
}

Get-SPServer | ?{$_.Role -eq "Application"} | ForEach-Object {
	Get-LoggedOnUser $_.Name
}

Is it possible to get list of installed application under one OU in active Directory.  I have 30 computers in One OU in Active Directory.  Needs to get list of all applications installed on those machines.

Anything is possible, however you will do the task in two different scripts.
1) read the computer account names from the OU
2) read the application lists from the servers

There are already scripts that do both of these tasks if you search.

Get your script to permanently be loaded into PS? I have to load it every time I open powershell.

Hi Todd.
The secret it to create a profile and then load it in the profile.
E.g.
New-Item $PROFILE.CurrentUserAllHosts -ItemType File

Then open the file:
E.g.
notepad $PROFILE.CurrentUserAllHosts

Then add the dot source in that script to load the function.
E.g.
. c:\fullpath\Get-LoggedOnUser.ps1

Then save and close the file, the next time you open powershell that script will run and the function will be available for you to call.

On the "create a profile" Suggestion, I get an error:
PS C:\scripts> New-Item $PROFILE.CurrentUserAllHosts -ItemType File
New-Item : Could not find a part of the path 'C:\Users\administrator\Documents\WindowsPowerShell\profile.ps1'.
At line:1 char:9
+ New-Item <<<<  $PROFILE.CurrentUserAllHosts -ItemType File
    + CategoryInfo          : WriteError: (C:\Users\admini...ell\profile.ps1:String) [New-Item], DirectoryNotFoundException
    + FullyQualifiedErrorId : NewItemIOError,Microsoft.PowerShell.Commands.NewItemCommand

It appears the first step should be "md WindowsPowerShell" (make a powershell directory under the folder for the profile you are trying to create).

FOUND IT! Okay, your function needs to be "loaded AS a function, and run as a function." It cannot be run as a standalone script. That was not made very clear. Maybe it should be obvious, but I'm just telling you that it is not clear that that is what is needed (maybe 'powershell [experts]' would already know that, but not 'normal mortal human beings'). That probably should have been THE first thing you mentioned. This is a very nice script offering! Thank you!

Well glad you got it worked out :)

Enjoy.

Thank you very much for this nice script.
Regards

Hi, I tested out your code and it works fine but for some computers, I can't tell who's logged on remotely.  Once I execute the "get-loggedonuser" command it will say "Cannot find any processes running" on a certain remote when I know a user is logged on remotely.  I'd appreciate some help in this matter.


Thanks

You are querying a WMI NameSpace/Class for this information.

You can test the raw cmdlets: 
Get-wmiobject -namespace root\cimv2 -class win32_process -CN WS123

By default the class requires you to have local admin rights to query.

If you want you can use some other credentials:
$cred = get-credential domain\user

Then add the following to the get-wmiobject query:
 -credential $cred

Let me know how you go.

This used DCOM/RPC to query which requires a large range of network ports to connect, if you can use compmgmt.msc and connect to the remote machine, then you should have permission to connect with Get-wmiobject.