For the NVMe device given, sends an identify command for controller list and provides the result and returned structure\&. This uses either mode 12h or 13h depending on the requested namespace identifier\&.
.sp
The <device> parameter is mandatory and may be either the NVMe character device (ex: /dev/nvme0), or a namespace block device (ex: /dev/nvme0n1)\&. The starting controller in the list always begins with 0 unless the \*(Aq\-\-cntid\*(Aq option is given to override\&.
.sp
On success, the controller array is printed for each index and controller identifier\&.
Retrieve the identify list structure starting with the given controller id\&.
.RE
.PP
\-n <nsid>, \-\-namespace\-id=<nsid>
.RS4
If provided, will request the controllers attached to the specified namespace\&. If no namespace is given, or set to 0, the command requests the controller list for the entire subsystem, whether or not they are attached to namespace(s)\&.