Change SharePoint group owner with Powershell to a SharePoint group

Question

I have this PS script to change the group owner of a SharePoint group to a domain user. I would like to use this script to change it to an existing SharePoint group. The current script only allows for domain users....

Any ideas?

#Get the SPWeb
$web = Get-SPWeb "URL"

#Get the Group
$group = $web.SiteGroups["Group 1"]
$group = $web.SiteGroups["Group 2"]
#Get the User 
$user = $web.EnsureUser("domain\user")

#Assign that user as the owner
$group.Owner = $user

#Update the Group
$group.Update()

Answer 1

You just need a small change to your PowerShell script.

$web = Get-SPWeb http://webUrl
$groupOwner = $web.SiteGroups["GroupA"] #this group will own "GroupB"
$groupTarget = $web.SiteGroups["GroupB"]
$groupTarget.Owner = $groupOwner
$groupTarget.Update()

For all groups in a web:

$web = Get-SPWeb http://webUrl
$groupName = "SharePoint Group Name" #this will be the owner
$groupOwner = $web.SiteGroups[$groupName]

foreach($group in ($web.SiteGroups | ?{$_.Name -ne $groupName}))
{
    $group.Owner = $groupOwner
    $group.Update()
}