Add SXA Tags to all SXA Pages

Add-TagToPages.ps1

$sitePath = "master:\content\Demo\Origin"

#get items but only those that are SXA pages
$pages = Get-ChildItem "$sitePath\Home" -Recurse -WithParent | 
    Where-Object { Test-BaseTemplate -Item $_ -Template "Foundation/Experience Accelerator/Multisite/Content/Page" } 
    #you can pipe it to further filtering here if you want to do it only for some pages

#get tag items that contain the word "Adam" in them
$tags = (@() + (Get-ChildItem "$sitePath\Data\Tags" -Recurse | 
    Where-Object { Test-BaseTemplate -Item $_ -Template "Feature/Experience Accelerator/Taxonomy/Datasource/Tag" } | 
    Where-Object { $_.Name -like "*Adam*" })).ID

if($tags.Count -gt 0){
    foreach($page in $pages){ 
        #for every page add the tags - make sure they are uniquely used and tags are not added twice.
        $page.SxaTags = (@() + $page._.SxaTags.GetItems().ID + $tags | select -Unique) -join "|"
    }
}