golang flag how to create aliases for set flags such as short versions

main.go

package main 

var flagAlias = map[string]string{
	"long-version": "lv",
}

func init() {
	for from, to := range flagAlias {
		flagSet := flag.Lookup(from)
		cli.Var(flagSet.Value, to, fmt.Sprintf("alias to %s", flagSet.Name))
	}
}