Usage Message

When the user provides an invalid flag or invalid command, Cobra responds by
showing the user the ‘usage’.

Example

You may recognize this from the help above. That’s because the default help
embeds the usage as part of its output.

$ cobra --invalid
Error: unknown flag: --invalid
Usage:
  cobra [command]
Available Commands:
  add         Add a command to a Cobra Application
  help        Help about any command
  init        Initialize a Cobra Application
Flags:
  -a, --author string    author name for copyright attribution (default "YOUR NAME")
      --config string    config file (default is $HOME/.cobra.yaml)
  -h, --help             help for cobra
  -l, --license string   name of license for the project
      --viper            use Viper for configuration (default true)
Use "cobra [command] --help" for more information about a command.

Defining your own usage

You can provide your own usage function or template for Cobra to use.
Like help, the function and template are overridable through public methods:

cmd.SetUsageFunc(f func(*Command) error)
cmd.SetUsageTemplate(s string)