Powershell - How to add multiple site collection admins as secondary?

Question

How to add multiple site collection admins for a given site for secondary? I tried below but it replaces existing secondary. Any idea?

Set-SPSite –Identity $siteCollectionUrl –SecondaryOwnerAlias "domain\jdoe"

Answer 1

If both primary and secondary owners are set, the only other way to add additional Site Collection admins is to use the New-SPUser command and include the switch parameter -SiteCollectionAdmin.

New-SPUser -UserAlias 'Contoso\Jdow' -DisplayName 'Jane Dow' -Web 'http://contoso.com' -SiteCOllectionAdmin

Answer 2

If you need more than two Site Collection admins for every Site Collection in a Web App, try the following.

    $webApp = Get-SPWebApplication "http://mysite.sharepoint.com"

    Foreach($site in $webApp.Sites)
    {
      New-SPUser -UserAlias "domain\user" -DisplayName "User Name" -Web $site.URL
      $usr = Get-SPUser "domain\user" -Web $site.URL
      $usr.IsSiteAdmin = $true
      $usr.Update()
     }

Eric's example worked in my Dev environment, but not my Test environment. The example I provided works in both.

The example could be cleaned up to validate the user and validate if they are already a site admin.

Answer 3

This would be easiest way with existing user for SharePoint Online:

$sites = gc sites.txt
foreach($site in $sites){set-spouser -Site $site -LoginName [email protected] -IsSiteCollectionAdmin $true}

This would be easiest way with existing user for SharePoint On-prem:

$sites = gc sites.txt
foreach($site in $sites)
{
   set-spuser -Web $site -Identity 'domain\alias' -IsSiteCollectionAdmin $true
}