judy@judy-EL1360G:~$ sudo nmcli dev --show
[sudo] password for judy: 
Usage: nmcli device { COMMAND | help }

  COMMAND := { status | list | disconnect | wifi }

  status
  list [iface <iface>]
  disconnect iface <iface> [--nowait] [--timeout <timeout>]
  wifi [list [iface <iface>] [bssid <BSSID>]]
  wifi connect <(B)SSID> [password <password>] [wep-key-type key|phrase] [iface <iface>] [bssid <BSSID>] [name <name>]
               [--private] [--nowait] [--timeout <timeout>]

Error: 'dev' command '--show' is not valid.
judy@judy-EL1360G:~$