func (f IntOption) ApplyPositional(set *flags.Set) { if f.EnvVar != "" { if envVal := os.Getenv(f.EnvVar); envVal != "" { envValInt, err := strconv.ParseUint(envVal, 10, 64) if err == nil { f.Value = int(envValInt) } } } eachName(f.Name, func(name string) { set.IntArg(name, f.Value, f.Usage, f.Var, f.Optional) }) }