Script to bulk assign 'My Site collection' secondary administrators

Question

Hi
Staff in my company have already logged in and created their own My Sites and when they did this it set themselves as the primary administrator but left the secondary administrator blank. I want to add spadmin to the secondary administrator role.
I know you can set the secondary My Site administrators using
Set -SPSite -identity https://my.company.org.uk/personal/jamesv -secondaryowneralias DOMAIN\spadmin
Could someone please help me put this into a loop which would cycle through all of the personal sites in that web application and then set spadmin as secondary administrator for all.
Id like to learn more about Powershell but not really sure where to look, what courses to do.. if anyone knows of any please also let me know.
Many Thanks
James

Answer 1

Change site collection administrators for all site collections 
Get-SPWebApplication "http://intranet.crescent.com" | Get-SPSite -Limit All | ForEach-Object { Set-SPSite $_ -OwnerAlias "<domain\user>" -SecondaryOwnerAlias "<domain\user>" }
Read more: http://www.sharepointdiary.com/2013/01/change-site-collection-primary-secondary-administrators.html#ixzz3AyBN7Taj
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