Grant Permission in SharePoint

You can grant permissions to a user or group in SharePoint using Windows PowerShell. Simply add the user or group to the role assignment collection:

PS > $spWeb = Get-SPWeb http://SP01.powershell.nu
PS > $spPrincipal = [Microsoft.SharePoint.SPPrincipal]$spWeb.SiteGroups[$rGroup]
PS > $spWeb.RoleAssignments.Add($spPrincipal)
PS > $spWeb.Dispose()

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