Powershell, Cleaning output data - powershell

Question

I'm writing a script to get the Username of any user logged on to any computer. It works fine with 2 Exceptions.
Here is the code:
$computername = Get-Content 'I:\NodeList\SWSL.txt'
Remove-item "I:\NodeList\UsersPC.txt"
foreach ($computer in $computername)
{
if(Test-Connection -Computername $Computer -BufferSize 16 -Count 1 -ea 0)
{
$Uinfo = gwmi win32_computersystem -comp $computer | select Username,Caption #,Manufacturer
$Uinfo | Out-File -Filepath "I:\NodeList\UsersPC.txt" -Append
Write-Host $Uinfo
}else{
Write-Host $computer " Is offline, not responing to ping"
$computer + " Is offline!" | Out-File -Filepath "I:\NodeList\UsersPC.txt" -Append
}
}
First the Output is:
USername Caption
-------- -------
BINYAN\Charlie SYD-WS04
But I would only like to have:
Charlie SYD-WS04
The domain is always the same, so I just need the username and the computer name, and NOT the headings or the "---"
2nd Problem is, we are a render farm and all renders are processed on a user account Called "Render".
For those computers I only get the computer name, Username is Blank.
This user account is a Domain user, but not in an OU like the others (Sydney, Melbourne, Brisbane).
It resides in the default "Users" folder in AD.

Answer 1

You could remove the domain name using a regex that replaces everything until and including a \: '.*?\\'
You get rid of the heading using select -expand or using a foreach loop where you select the properties using $_.PROPERTY
So your statement could look like this:
$Uinfo = gwmi win32_computersystem -comp $computer |
foreach { '{0} {1}' -f ($_.Username -replace '.*?\\'), $_.Caption }
I have no answer for / I dont understand your second question.