running a function periodically in go

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?

Solution

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.