Golang exec.Command多管道

package main

import (
	"fmt"
	"io/ioutil"
	"os/exec"
)

func main() {
	cmd := exec.Command("ls", "-l")

	stdout, err := cmd.StdoutPipe()
	if err != nil {
		fmt.Println("Error creating StdoutPipe:", err)
		return
	}

	stderr, err := cmd.StderrPipe()
	if err != nil {
		fmt.Println("Error creating StderrPipe:", err)
		return
	}

	if err := cmd.Start(); err != nil {
		fmt.Println("Error starting command:", err)
		return
	}

	stdoutBytes, err := ioutil.ReadAll(stdout)
	if err != nil {
		fmt.Println("Error reading stdout:", err)
		return
	}

	stderrBytes, err := ioutil.ReadAll(stderr)
	if err != nil {
		fmt.Println("Error reading stderr:", err)
		return
	}

	if err := cmd.Wait(); err != nil {
		fmt.Println("Error waiting for command:", err)
		return
	}

	fmt.Println("Stdout:", string(stdoutBytes))
	fmt.Println("Stderr:", string(stderrBytes))
}