Simple script/binary that prints a message at a prescribed --interval either infinitely or for --count number of times.

cheerleader.go

// author: tyndyll
// Simple script/binary that prints a message at a prescribed --interval either infinitely or
// for --count number of times.
// It is being used a simple service target for setting up and testing systemd files. To that
// end it handles SIGINT
//
// To use:
//
// ~GOPATH  go run src/cheerleader.go --interval 1 --count 1
// I am the cheerleader, I will save the world
// Exiting
// ~GOPATH  go install src/cheerleader.go
// ~GOPATH  bin/cheerleader
// I am the cheerleader, I will save the world
// ^Csignal =  interrupt
// SIGINT caught. Exiting

package main

import (
	"flag"
	"fmt"
	"os"
	"os/signal"
	"syscall"
	"time"
)

func main() {
	message := flag.String("message", "I am the cheerleader, I will save the world", "Message to be printed")
	interval := flag.Int("interval", 5, "Number of seconds between iterations")
	count := flag.Int("count", 0, "Number of iterations (<1 for forever)")

	flag.Parse()

	// Handle SIGINT
	sigchan := make(chan os.Signal, 1)
	signal.Notify(sigchan, syscall.SIGINT)
	go func() {
		select {
		case sig := <-sigchan:
			fmt.Println("signal = ", sig)
			if sig == os.Interrupt {
				fmt.Println("SIGINT caught. Exiting")
				os.Exit(0)
			}
		}
	}()

	loop_forever := false
	if *count < 1 {
		loop_forever = true
	}

	for {
		fmt.Println(*message)
		time.Sleep(time.Second * time.Duration(*interval))
		if !loop_forever {
			*count--
			if *count < 1 {
				break
			}
		}
	}
	fmt.Println("Exiting")
}