pkg/cli/env.go
func StrEnvDef(env string, def string) string {
	val := os.Getenv(env)
	if val == "" {
		return def
	}
	return val
}
func StrEnvDef(env string, def string) string {
	val := os.Getenv(env)
	if val == "" {
		return def
	}
	return val
}
// StrEnvDef get environment variable, or some default def