PowerShell: Add Accounts into Local Administrators Group

# addAccountToLocalAdmins.ps1
# Requires: PowerShell Version 4.0+

$accountToAdd='ServerAdmins'
$groupName="Administrators"
$servers=@(
	"CONCU1",
	'CONCU2', 
	'CONCU100',
	'CONCU80665', 
	'CONCU6547354',
	'CONWHAT989', 
	'CONCU3'
)

$servers|%{
    $session=new-pssession $_
	invoke-command -session $session -scriptblock{
		param($principleName,$groupName)
		write-host "Adding $principleName into $groupName";
		Add-LocalGroupMember -Group $groupName -Member $principleName;
		write-host "$env:computername group $groupName now has these members:`r`n";
		get-localgroupmember $groupName|ft -autosize
		} -args $accountToAdd,$groupName
    remove-pssession $session
	}

sample output

ObjectClass Name                          PrincipalSource
----------- ----                          ---------------
User        SERVERX\ServerAdmins Local
User        SERVERX\Johnito    Local