parsing the bytes from a shell program in my golang program

Question

i am trying to call a shell program using golang (os/exec) but the output i am getting is in bytes and i need to convert it into float64 but it is showing error?
error: cannot convert out (type []byte) to type float64

     func Cpu_usage_data() (cpu_predict float64, err error) {
     out,err1 := exec.Command("/bin/sh","data_cpu.sh").Output()
 if err1 != nil {
      fmt.Println(err1.Error())
    }
  return float64(out), err1
    } 

data_cpu.sh is:

  top -b n 1 | egrep -w 'apache2|mysqld|php' | awk '{cpu += $9}END{print cpu/NR}'

Answer 1

Use bytes.Buffer and strconv.ParseFloat.

func Cpu_usage_data() (cpu_predict float64, err error) {
    cmd := exec.Command("/bin/sh", "data_cpu.sh")
    var out bytes.Buffer
    cmd.Stdout = &out
    err = cmd.Run()
    if err != nil {
        fmt.Println(err.Error())
    }
    cpu_predict, err = strconv.ParseFloat(out.String(), 64)
    if err != nil {
        fmt.Println(err.Error())
    }
    return 
}