return sub
		}
	}
	return nil
}

// hasFlag reports whether a command or any of its subcommands contain the given
// flag.
func hasFlag(c *Command, name string) bool {
	if f := c.Flag.Lookup(name); f != nil {
		return true
	}
	for _, sub := range c.Commands {
		if hasFlag(sub, name) {
			return true
		}
	}
	return false
}