help: System loging banner post-login
type: txt

update: sudo /opt/vyatta/sbin/vyatta-banner.pl \
             --action=update --banner-type=post-login

delete: sudo /opt/vyatta/sbin/vyatta-banner.pl \
             --action=delete --banner-type=post-login

comp_help: possible completions:
  <txt>   Set login banner 
          (example: "\\n\\n\\tWelcome to Vyatta!\\n")