estruyf · May 2, 2014 12:30
diff --git a/Remove Unused SharePoint Groups b/Remove Unused SharePoint Groups
 $site = Get-SPSite -Identity "http://YourSiteCollectionUrl"

 # Retrieve used SharePoint groups
 $groupsInUse = $site.AllWebs | % {$_.RoleAssignments | Select-Object Member}
 $groupsInUse = $groupsInUse | % {$_.member.Tostring()}
 $groupsInUse = $groupsInUse | Sort-Object | Get-Unique
 $groupsInUse = $groupsInUse | ? {$_ -notmatch '\\' -and  !$_.ToString().StartsWith('c:0(.s|') }

 # Retrieve all SharePoint groups
 $allGroups = $site.RootWeb.SiteGroups | Select-Object name
 $allGroups = $allGroups |% {$_.name.Tostring()}
 $allGroups = $allGroups |Sort-Object|Get-Unique

 # Compare groups
 $groupsNotInUse = Compare-Object $allGroups $groupsInUse
 $groupsNotInUse = ($groupsNotInUse|Select-Object InputObject)
 $unusedGroups = $groupsNotInUse | % {$_.InputObject.Tostring()}

 # Print unused groups
 Write-host $unusedGroups | Write-Host $_

 # Remove unused groups
 $allGroups = $site.RootWeb.SiteGroups
 $unusedGroups | % {$allGroups.Remove($_)}

 $site.Dispose()