In SharePoint 2013 ,
Copy-SPSite command :
Copy-SPSite Source Site URL [-DestinationDatabase Destination DB] -TargetUrl Target Site URL
Copy-SPSite command :
Copy-SPSite Source Site URL [-DestinationDatabase Destination DB] -TargetUrl Target Site URL
Remove-SPSiteUrl command:
Remove-SPSiteURL -URL Host named Site collection URL
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