SharePoint 2010 Powershell read lookup or person field & add value

Powershell is great, powershell can do really great things if you know how to. So i would like to share some experiences with you.

Basic: Get the list and the item of your list:

$Web = Get-SPWeb "http://server/sites/sitecollection"
$List = $Web.Lists["Listname"]
//All items where ID is equal "1" you can set it as you like
$Item = $List.Items | ? {$_["ID"] -eq "1"}
$groupcol = $Item["YourField"]

Reading the values of a lookup

$ValueCollection = New-Object Microsoft.SharePoint.SPFieldUserValueCollection
foreach($group in $groupcol)

Adding value to this field

//This value collection will be saved afterwords into the field and it overrides the old values
$ValueCollection = New-Object Microsoft.SharePoint.SPFieldUserValueCollection
foreach($group in $groupcol)
//Add the old values to the new Value collection
$ = "1"
$myGroup.Name = "Test"
$GroupValue = new-Object Microsoft.SharePoint.SPFieldUserValue($Web,
$, $myGroup.Name)
$Item["YourField"] = $ValueCollection

Hope this helps.


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About Karsten Schneider 306 Articles
Consultant for Microsoft 365 Applications with a strong focus in Teams, SharePoint Online, OneDrive for Business as well as PowerPlatform with PowerApps, Flow and PowerBI. I provide Workshops for Governance & Security in Office 365 and Development of Solutions in the area of Collaboration and Teamwork based on Microsoft 365 and Azure Cloud Solutions. In his free time he tries to collect tipps and worthy experience in this blog.