Add a user or group to site collection administrators group of every site collection - via powershell

Use following scripts:

This script adds a user or group to the Site Collection Administrators Group of every Site Collection of a Web Application. Define your parameters in line 1 and line 2.

	$AccountList = @("Domain\UserOrGroup")
	$webapp = Get-SPWebApplication -Identity https://webapplicationurl/
	foreach ($SiteCollection in $webapp.Sites)
	{
	write-host $SiteCollection.url
	$spweb = Get-SPWeb $SiteCollection.url
	foreach ($Account in $AccountList)
	{
	$user = Get-SPUSER -identity $Account -web $SiteCollection.url -ErrorAction SilentlyContinue
	if ($user -eq $null)
	{
	$SPWeb.ALLUsers.ADD($Account, "", "", "Added by SiteCollectionAdminScript")
	$user = Get-SPUSER -identity $Account -web $SiteCollection.url
	Write-host "Added user $Account to URL $SPWeb.URL" -Foregroundcolor green
	}
	else
	{
	Write-host "user $Account was already in URL " $SPWeb.URL -Foregroundcolor red
	}
	if ($user.IsSiteAdmin -ne $true)
	{
	$user.IsSiteAdmin = $true
	$user.Update()
	Write-host "$account has been made an admin on $SPWeb.URL" -Foregroundcolor green
	}
	else
	{
	Write-host "$account was already an admin on $SPWeb.URL" -Foregroundcolor red
	}
	}
	}

view raw addUserOrGroupToAllSiteCollectionAdministratorsPerWebApplication.ps1 hosted with ❤ by GitHub

or

This script adds a user or group to the Site Collection Administrators Group of every Site Collection Farm-wide. Define your User or Group in line 2.

	#example: $AccountList = @("DOMAIN\User" , "DOMAIN\Group")
	$AccountList = @("DOMAIN\User")
	$wapps = Get-SPWebApplication
	Foreach($webapp in $wapps)
	{
	foreach ($SiteCollection in $webapp.Sites)
	{
	write-host $SiteCollection.url
	$spweb = Get-SPWeb $SiteCollection.url
	foreach ($Account in $AccountList)
	{
	$user = Get-SPUSER -identity $Account -web $SiteCollection.url -ErrorAction SilentlyContinue
	if ($user -eq $null)
	{
	$SPWeb.ALLUsers.ADD($Account, "", "", "Added by SiteCollectionAdminScript")
	$user = Get-SPUSER -identity $Account -web $SiteCollection.url
	Write-host "Added user $Account to URL $SPWeb.URL" -Foregroundcolor green
	}
	else
	{
	Write-host "user $Account was already in URL " $SPWeb.URL -Foregroundcolor red
	}
	if ($user.IsSiteAdmin -ne $true)
	{
	$user.IsSiteAdmin = $true
	$user.Update()
	Write-host "$account has been made an admin on $SPWeb.URL" -Foregroundcolor green
	}
	else
	{
	Write-host "$account was already an admin on $SPWeb.URL" -Foregroundcolor red
	}
	}
	}
	}

view raw addUserOrGroupToAllSiteCollectionAdministratorsFarmwide.ps1 hosted with ❤ by GitHub