az signalr --help Manage Azure SignalR Service.

[addaxnasom]

Group
    az signalr : Manage Azure SignalR Service.

Subgroups:
    cors    : Manage CORS for Azure SignalR Service.
    key     : Manage keys for Azure SignalR Service.

Commands:
    create  : Creates a SignalR Service.
    delete  : Deletes a SignalR Service.
    list    : Lists all the SignalR Service under the current subscription.
    restart : Restart an existing SignalR Service.
    show    : Get the details of a SignalR Service.
    update  : Update an existing SignalR Service.