Replace Part of DisplayName Using PowerShell

Question

Hello,
I am trying to replace part of a display name using powershell. For example, our display names look like this:
"Lname, Fname/Department"
I'm trying to replace only the department, basically what is after the /, from "Information Systems" to "IT"
Here's what I have but it is failing:
Get-ADUser "ex10testertesters" | % { Set-AdUser $_ -DisplayName ($_.Displayname -replace 'Information Systems$','IT') }
Error I am getting is below:
Set-ADUser : replace
At line:1 char:48
+ Get-ADUser "test" | % { Set-AdUser <<<<  $_ -DisplayName ($_.Dis
playname -replace '/Information Systems','IT') }
    + CategoryInfo          : InvalidOperation: (CN=ex10tester...DC=company,DC
   =com:ADUser) [Set-ADUser], ADInvalidOperationException
    + FullyQualifiedErrorId : replace,Microsoft.ActiveDirectory.Management.Com
   mands.SetADUser
Can anyone assist in what the issue is? Thank you!

Answer 1

DisplayName is not a default attribute returned by Get-ADUser; you'll need to specify it.
Get-ADUser "ex10testertesters" -Properties 'DisplayName' | % {
$newDisplayName = $_.Displayname -replace 'Information Systems$','IT'
Set-AdUser $_ -DisplayName:$newDisplayName