Display status of failover status of a Cisco ASA or FWSM.
This has been tested and confirmed to work for both Cisco ASA and FWSM in single and multiple context mode.
In cases where failover has not been configured the status of the Primary and Secondary units will show as "down".
Update: This also works with a Firepower (i.e. FTD) device running version 6.2.0 - 126.96.36.199. FTD 6.2.1 is currently un-tested.