Powershell command to disable an installed SharePoint Feature at a given scope

Disable-SPFeature [-Identity] <SPFeatureDefinitionPipeBind> [-AssignmentCollection <SPAssignmentCollection>] [-Confirm [<SwitchParameter>]] [-Force <SwitchParameter>] [-Url <String>] [-WhatIf [<SwitchParameter>]]

Identity -

Specifies the name of the Feature or GUID to disable.
The type must be the name of the Feature folder located in the 14\Template\Features folder or GUID, in the format 21d186e1-7036-4092-a825-0eb6709e9281.

Other Parameters are optional

Source : http://technet.microsoft.com/en-us/library/ff607879.aspx

Detailed Description

The Disable-SPFeature cmdlet disables a SharePoint Feature at the given scope. If the scope of the Feature is the farm, the URL is not needed. Otherwise, provide the URL at which this Feature is to be deactivated (explicit scope is not needed).