pkg/cli/env.go
func IntEnvDef(env string, def int) int {
	val := os.Getenv(env)
	if val == "" {
		return def
	}
	ival, err := strconv.Atoi(val)
	if err != nil {
		return def
	}
	return ival
}
func IntEnvDef(env string, def int) int {
	val := os.Getenv(env)
	if val == "" {
		return def
	}
	ival, err := strconv.Atoi(val)
	if err != nil {
		return def
	}
	return ival
}
// IntEnvDef get environment variable, or some default def