Writing to multiple writers at once

When you need to write the same output into more than one target, there is a helping hand available in the built-in package. This recipe shows how to implement writing simultaneously into multiple targets.

How to do it...

1. Open the console and create the folder chapter05/recipe08.
2. Navigate to the directory.
3. Create the multiwr.go file with the following content:

        package main

        import "io"
        import "bytes"
        import "os"
        import "fmt"

        func main() {

          buf := bytes.NewBuffer([]byte{})
          f, err := os.OpenFile("sample.txt", os.O_CREATE|os.O_RDWR,
                                os.ModePerm)
          if err != nil {
            panic(err)
          }
          wr := io.MultiWriter(buf, f)
          _, err = io.WriteString(wr, "Hello, Go is awesome!")
          if err != nil {
            panic(err)
          }

          fmt.Println("Content of buffer: " + buf.String())
        }

4. Execute the code by go run...