Execute adds all child commands to the root command and sets flags appropriately.
This is called by main.main(). It only needs to happen once to the rootCmd.
type Book struct {
Name string `yaml:"name"`
Path string `yaml:"path"`
Schedule int `yaml:"schedule"`
RowNum int `yaml:"rowNum"`
Proportion float64 `yaml:"proportion"`
Remark string `yaml:"remark"`
}