PowerShell: Find all users in a specific OU

One of my customers asked for an overview of the UPNs of all users in a specific OU. Having become fairly familiar with the Get-ADUser command, I decided to see if I couldn’t make it do this, too.

I knew that I would need to filter the results of the command on OU, and found that the -filter parameter, combined with -SearchBase would give me what I wanted. To this end, I ran the following command:

Get-ADUser -Filter * -SearchBase “ou=ouname,dc=company,dc=com”

That, however, did not give me the result I was looking for. For that, I needed to pipe the results through a second command to get the UPN, and then a third to select it and output it to a file.

Get-ADUser -Filter * -SearchBase “ou=ouname,dc=company,dc=com” | Get-ADUser -property UserPrincipalName | select UserPrincipalName > results.txt