在golang中，如何将exec.Cmd的标准输出写入文件？

Question

I am trying to run a shell command, capture stdout and write that output to a file. However, I seem to be missing a few steps, as the file I am trying to write is empty when the program exists. How can I capture the stdout of the command and write that to a file?

package main

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

func main() {

    cmd := exec.Command("echo", "'WHAT THE HECK IS UP'")

    // open the out file for writing
    outfile, err := os.Create("./out.txt")
    if err != nil {
        panic(err)
    }
    defer outfile.Close()

    stdoutPipe, err := cmd.StdoutPipe()
    if err != nil {
        panic(err)
    }

    writer := bufio.NewWriter(outfile)

    err = cmd.Start()
    if err != nil {
        panic(err)
    }

    go io.Copy(writer, stdoutPipe)
    cmd.Wait()
}

Answer 1

You need to flush the writer. Add the following:

    writer := bufio.NewWriter(outfile)
    defer writer.Flush()