如何使用Golang执行'top'命令输出

Question

I want to write the 'top' command's output to another file. But when I tried it with the below code, I get the below error:

'exit status 1'.

Here is my code:

package main

import "os/exec"

func main() {
    app := "top"
    cmd := exec.Command(app)
    stdout, err := cmd.Output()

    if err != nil {
        println(err.Error())
        return
    }

    print(string(stdout))
}

Any help is greatly appreciated. Thanks in advance.

Answer 1

From man page for "top", -b option is good for sending output to another program (no color, no anything) as plain text, and -n is the number of frame it will iterate before stopping. Without -n it will iterate infinite time.

 func main() {
      app := "top"
      arg0 := "-b"
      arg1 := "-n"
      arg2 := "1"

      cmd := exec.Command(app, arg0, arg1, arg2)
      stdout, err := cmd.Output()

      if err != nil {
        println(err.Error())
        return
      }

      print(string(stdout))
    }