Get users on all servers

## Username in Samaccount name form
$user = "username"

Function Get-LoggedInuser {

<#
    .SYNOPSIS
        Shows all the users currently logged in to specified or remote computers

    .DESCRIPTION
        Shows the users currently logged into the specified computername if not specified local computers will be shown.

    .PARAMETER ComputerName
        One or more computernames

    .EXAMPLE
        PS C:\> Get-LoggedInUser
        Shows the users logged into the local system

    .EXAMPLE
        PS C:\> Get-LoggedInUser -Computer server1,server2,server3
        Shows the users logged into server1, server2, and server3

    .EXAMPLE
        PS C:\> Get-LoggedInUser  | where{$_.sessionname -match 'RDP'}  ## shows where users are connected VIA RDP

    .Example

        PS C:\> Get-ADComputer -Filter *|select -exp name |Foreach{Get-LoggedInUser -Computer $_ }
        Shows all computers in active directory computers

    .Example

        PS C:\> get-content C:\listofcomputers.txt |Foreach{Get-LoggedInUser -Computer $_ }
        Shows all computers in the text file.

    .Example

        PS C:\> Get-LoggedInUser -computer server1,server2  | where{$_.username -eq 'admin'}
       Shows where a user islogged in to.

    .MORE
         [PSCustomObject]@{
          ComputerName    = $Comp
          Username        = $line.SubString(1, 20).Trim()
          SessionName     = $line.SubString(23, 17).Trim()
          #ID             = $line.SubString(42, 2).Trim()
          State           = $line.SubString(46, 6).Trim()
          #Idle           = $line.SubString(54, 9).Trim().Replace('+', '.')
          #LogonTime      = [datetime]$line.SubString(65)

          Remove # Against each if you want to see the Output of the Value

************************************************************************
 Notes: Run as administrator
 Author: Jiten https://community.spiceworks.com/people/jitensh
Date Created: 08/30/2018
     Credits:
Last Revised: 08/30/2018
************************************************************************
#>

[cmdletbinding()]
   param(
   [String[]]$Computer = $env:COMPUTERNAME
   )

   ForEach ($Comp in $Computer)
   {
   If (-not (Test-Connection -ComputerName $comp -Quiet -Count 1 -ea silentlycontinue))
   {
   Write-Warning "$comp is Offline"; continue
   }
   $stringOutput = quser /server:$Comp 2>$null
      If (!$stringOutput)
      {
      Write-Warning "Unable to retrieve quser info for `"$Comp`""
      }
      ForEach ($line in $stringOutput){
         If ($line -match "logon time")
         {Continue}

         [PSCustomObject]@{
          ComputerName    = $Comp
          Username        = $line.SubString(1, 20).Trim()
          SessionName     = $line.SubString(23, 17).Trim()
          ID             = $line.SubString(42, 2).Trim()
          State           = $line.SubString(46, 6).Trim()
          #Idle           = $line.SubString(54, 9).Trim().Replace('+', '.')
          #LogonTime      = [datetime]$line.SubString(65)
          }

      }
   }
}

$serv=Get-ADComputer -Filter {operatingsystem -like "*Server*"}
$s=@()
$serv | % {$s+=$_.name}
Get-LoggedInuser -Computer $s | ?{$_.username -like $user}