Provisioning Groups and Assigning Permissions within SharePoint Subsites with PowerShell

The following snippet shows how you might provision a new group within a subsite of SharePoint using PowerShell. Note that you not only need to create the group – you also need to associate it with the subsite, and assign permissions to the relationship between the group and the subsite. It’s not obvious at all.

# Connect to SharePoint Site
$web = get-spweb "https://server/sites/site_collection/subsite"

$group_name = "My Group"

# Remove group if it already exists
if ($web.SiteGroups[$group_name] -ne $null)
    $web.SiteGroups.Remove($group_name) > $null
    $web.Update() > $null

# Create the group
$web.SiteGroups.Add($group_name, $web.Site.Owner, $web.Site.Owner, $group_name) > $null
$web.Update() > $null

# Add Group to Associated Groups Collection
if ($web.AssociatedGroups[$group_name] -eq $null)

# Assign Permissions to the Group
$group = $web.SiteGroups[$group_name]
$group_role_assignment = new-object Microsoft.SharePoint.SPRoleAssignment($group)
$full_control_role_definition = $web.RoleDefinitions["Full Control"]
$group_role_assignment.RoleDefinitionBindings.Add($full_control_role_definition) > $null
$web.RoleAssignments.Add($group_role_assignment) > $null

# Release resources

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