exec_scanner.go

package main

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

func main() {
	if err := run(); err != nil {
		log.Fatal(err)
	}
}

func run() error {
	cmd := exec.Command("ls")
	stdout, err := cmd.StdoutPipe()
	if err != nil {
		return err
	}
	stderr, err := cmd.StderrPipe()
	if err != nil {
		return err
	}
	if err := cmd.Start(); err != nil {
		return err
	}
	scanner := bufio.NewScanner(io.MultiReader(stdout, stderr))
	for scanner.Scan() {
		fmt.Println(scanner.Text())
	}
	if err := scanner.Err(); err != nil {
		return err
	}
	return cmd.Wait()
}