bulk update item property

This PS script will iterate over a list of items and change a given property, then publish.

## Set a list of pages where we want to change the prop
$itemPathsToEdit = (
    "master:/sitecore/content/path/to/item1",
    "master:/sitecore/content/path/to/item2",
    "master:/sitecore/content/path/to/item3"
)

$existingPropItemId = "{79C5D158-68E5-4775-AE3F-8B672D53D64D}";
$destinationPropItemId = "{4B56828B-F8D3-4C54-B771-6618F2699229}";
$propToUpdate = "PROP";

## Iterate over the list
foreach($itemPath in $itemPathsToEdit)
{
    ## Get the item by path and check it exists
    $item = Get-Item -Path $itemPath

    if($item -ne $null)
    {
        ## Ensure the prop is set to what we expect
        if($item.Fields[$propToUpdate].Value -eq $existingPropItemId)
        {
                Write-Host "Updating $propToUpdate of item at path:" $itemPath
            
                ## Open editing, set new prop value, close editing  
                $item.Editing.BeginEdit()
                $item.Fields[$propToUpdate].Value = $destinationPropItemId
                $item.Editing.EndEdit()

                ## Publish item
                Publish-Item -Id $item.ID -PublishMode Full -Language '*' -RepublishAll -Verbose
        }
    }
}

Write-Host "Complete"