A Metronome example, developed in Golang. Takes a bpm and count as input.

metronome.go

package main

import (
	"fmt"
	"log"
	"os"
	"strconv"
	"time"
)

func main() {
	bpm, err := strconv.Atoi(os.Args[1])
	count, err2 := strconv.Atoi(os.Args[2])

	if err != nil || err2 != nil {
		log.Fatal(err)
	}

	times := time.Duration(bpm)
	for index := 0; index < count; index++ {
		fmt.Println("beep")
		time.Sleep(time.Minute / times)
	}
}