vyos@1.4.0-rc1:~$ show firewall 
Possible completions:
  <Enter>               Execute the current command
  bridge                Show bridge firewall
  group                 Show firewall group
  ipv4                  Show IPv4 firewall
  ipv6                  Show IPv6 firewall
  statistics            Show statistics of firewall application
  summary               Show summary of firewall application

      
vyos@1.4.0-rc1:~$ show zo

  Invalid command: show [zo]
      
vyos@1.4.0-rc1:~$ show zo

vyos@vyos:~$ show zone-policy 
Possible completions:
  <Enter>               Execute the current command
  zone                  Show summary of zone policy for a specific zone

      
vyos@vyos:~$ show zone-policy zone 
Possible completions:
  <text>                Show summary of zone policy for a specific zone

      
vyos@vyos:~$ show zone-policy zone