Add Custom Permission Levels using PowerShell

Add Custom Permission Levels using PowerShell 

$spSite = Get-SPSite "http://abc/sites/xyz"

  

$spWeb = $spSite | Get-SPWeb

# we add a new Permission Level name "MyCustomPermission" to the site, which will allow users to only add new items (no editing or removing)

# check to see if the permission your are going to add is already existing.. if null proceed

if($spWeb.RoleDefinitions["MyCustomPermission"] -eq $null)

{

    $spRoleDefinition = New-Object Microsoft.SharePoint.SPRoleDefinition

    $spRoleDefinition.Name = "MyCustomPermission"

    $spRoleDefinition.Description = "Can only Add items"

    $spRoleDefinition.BasePermissions = "ViewListItems, AddListItems, Open, ViewPages"

    $spWeb.RoleDefinitions.Add($spRoleDefinition)

}

$spWeb.Dispose()

$spSite.Dispose()



Note : Below command will list , all the base permissions options in the 


[System.Enum]::GetNames("Microsoft.SharePoint.SPBasePermissions")