- zypper
- zypper help
- zypper -h
  show list of global options and list of commands

- zypper help help
- zypper help -h
  show usage hint for the help command

- zypper help unknown-command
  show 'unknown command' message
  show unknown command hint

- zypper help command
- zypper -h command
- zypper command -h
  show command specific help text

- zypper unknown-option help
  show unknown option message
  show unknown option hint

- zypper unknown-command help
  show 'unknown command' message
  show unknown command hint

in shell

- empty line entered
  show unknown command hint

- help
  show list of global options and list of commands

- help help
- help -h
  show usage hint for the help command

- help unknown-command
  show 'unknown command' message
  show unknown command hint

- help command
- command -h
  show command specific help text

- unknown-command help
  show 'unknown command' message
  show unknown command hint
