running a function periodically in go

Question

I have a function like this:

func run (cmd string) [] byte {     out,err = exec.Command(cmd).Output()     if error!=nil {          log.Fatal (err)      }     return out } 

I would like to run this command this way

run ("uptime") // run every 5 secs run ("date") // run every 10 secs 

I would like to run these commands and collect its output and do something with it. How would I do this in go?

Answer 1

Use a time.Ticker. There's many ways to structure the program, but you can start with a simple for loop:

uptimeTicker := time.NewTicker(5 * time.Second) dateTicker := time.NewTicker(10 * time.Second)  for {     select {     case <-uptimeTicker.C:         run("uptime")     case <-dateTicker.C:         run("date")     } } 

You may then want to run the commands in a goroutine if there's a chance they could take longer than your shortest interval to avoid a backlog in the for loop. Alternatively, each goroutine could have its own for loop with a single Ticker.

Answer 2

func main() {     for range time.Tick(time.Second * 10) {         function_name()     } }