Creating windows users and groups with powershell

GroupCommands.ps1

$fakeUserName = "Some Engineer"
$fakeUserDescription = "A fake engineer used for testing purposes"

$groups = @(
	[System.Tuple]::Create('My Group', 'Users who have two thumbs'),
	[System.Tuple]::Create('My Other Group', 'Users who have no thumbs')
)

function GetADSI()
{
	# Active Directory Service Interfaces (ADSI) is
	# a set of COM interfaces that can be used to do
	# common administrative tasks, such as adding users
	# and groups.
	#
	# The namespace for ADSI is 'WinNT'	
	return [ADSI]("WinNT://$env:COMPUTERNAME")
}

function CreateUser([string]$userName, [string]$description = "")
{
	if(![ADSI]::Exists("WinNT://./$userName"))
	{
		Write-Host "Creating user: `"$userName`" with description: `"$description`" ..."
		$ADSI = GetADSI
		$user = $ADSI.Create('User', $userName)
		$user.SetInfo()
		$user.Description = $description
		$user.SetInfo()
	}
	else
	{
		Write-Host "User `"$userName`" exists already. Skipping user creation ..."
	}
}

function RemoveUser([string]$userName)
{
	if([ADSI]::Exists("WinNT://./$userName"))
	{
		Write-Host "Removing user: `"$userName`" ..."
		$ADSI = GetADSI
		$user = $ADSI.Children.Find($userName, 'User')
		$ADSI.Children.Remove($user)
	}
	else
	{		
		Write-Host "User `"$userName`" doesn't exist. Skipping..."
	}
}

function AddGroup([string]$groupName, [string]$description)
{
	if(![ADSI]::Exists("WinNT://$env:COMPUTERNAME/$groupName"))
	{	
		Write-Host "Creating group $groupName ..."	
		$ADSI = GetADSI
		$group = $ADSI.Create('Group', $groupName)
		$group.SetInfo()
		$group.Description = $description
		$group.SetInfo()
	}
	else
	{
		Write-Host "Group `"$groupName`" exists. Skipping creation ..."
	}	
}

function RemoveGroup([string]$groupName)
{
	if([ADSI]::Exists("WinNT://$env:COMPUTERNAME/$groupName"))
	{ 
		Write-Host "Removing group: `"$groupName`" ..."		
		$ADSI = GetADSI
		$group = $ADSI.Children.Find($groupName, 'Group')
		$ADSI.Children.Remove($group)
	}
	else
	{
		Write-Host "Group `"$groupName`" doesn't exist. Skipping..."
	}	
}

function AddUserToGroup([string]$userName, [string]$groupName)
{	
	if(![ADSI]::Exists("WinNT://$env:COMPUTERNAME/$groupName"))
	{
		Write-Host "Group `"$groupName`" does not exist. Skipping ..."
		return
	}

	if(![ADSI]::Exists("WinNT://./$userName"))
	{
		Write-Host "User `"$userName`" does not exist. Skipping removal from group ..."
		return
	}	
		
	try
	{
		$ADSI = GetADSI
		$group = $ADSI.Children.Find($groupName, 'Group')
		$group.Add(("WinNT://$env:COMPUTERNAME/$userName"))		
		Write-Host "Added user: $userName to group: $groupName"	
	}
	catch
	{
		Write-Host "The user `"$userName`" may already be part of the group `"$groupName`". Skipping ..."
	}
}

function RemoveUserFromGroup([string]$userName, [string]$groupName)
{
	if(![ADSI]::Exists("WinNT://$env:COMPUTERNAME/$groupName"))
	{
		Write-Host "Group `"$groupName`" does not exist. Skipping ..."
		return
	}

	if(![ADSI]::Exists("WinNT://./$userName"))
	{
		Write-Host "User `"$userName`" does not exist. Skipping removal from group ..."
		return
	}	
	
	try
	{
		$ADSI = GetADSI
		$group = $ADSI.Children.Find($groupName, 'Group')
		$group.Remove("WinNT://$env:COMPUTERNAME/$userName")
		Write-Host "Added user: $userName to group: $groupName"	
	}
	catch
	{
		Write-Host "User `"$userName`" may already be part of the group `"$groupName`". Skipping ..."
	}
}

SetupUserGroups.ps1

. (Join-Path -Path $PSScriptRoot -ChildPath "GroupCommands.ps1")

CreateUser $fakeUserName $fakeUserDescription

$groups | ForEach-Object {
	AddGroup $_.Item1 $_.Item2
	AddUserToGroup $fakeUserName $_.Item1
}