import ( "flag" "fmt" "time" ) func main() { fs := flag.NewFlagSet("MyFlags", flag.ExitOnError) durationValue := fs.Duration("duration", 5*time.Second, "duration of time to sleep") fs.Parse(os.Args[1:]) fmt.Printf("Snoozing for %v ...\n", *durationValue) time.Sleep(*durationValue) }In this example, the `DurationVar` is used to sleep for a specified duration of time defined by the user via the `duration` flag. Overall, the `flag` package library in Go provides a convenient way of parsing command-line arguments by creating flexible and easy-to-use flags named after the variable they will be assigned to.