bufio.NewScanner.Scan挂起程序

Question

I have the following code snippet

package main
import (
  "os/exec"
  "bufio"
  "fmt"
)

func main() {
  cmd := exec.Command("terraform", "init")
  cmd.Dir = ""
  stdout, _ := cmd.StdoutPipe()
  stdoutScanner := bufio.NewScanner(stdout)
  stdoutScanner.Scan()
  fmt.Println("End of main")
}

stdoutScanner.Scan() hangs forever without any outputs

I am in a VPC with proxy.

Is there any possible reason why this happens ?

Answer 1

Comments were added where ever required.

package main

import (
    "bufio"
    "fmt"
    "log"
    "os"
    "os/exec"
)

func main() {
    //args should be specified as you provide them in terminal
    cmd := exec.Command("ls", "-l", "-h")
    //set all required parameters
    cmd.Stdin = os.Stdin
    stdout, _ := cmd.StdoutPipe()
    b := bufio.NewScanner(stdout)
    //start the command
    err := cmd.Start()
    if err != nil {
        log.Println(err)
    }
    //see if you have something, until EOF
    //b.Scan() blocks until you get some input, or EOF
    //It's something like streaming input.
    for b.Scan() {
        //print the input
        fmt.Println(b.Text())
    }
}