Go Standard Library Cookbook

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 multiwr.go.

5. See the output:

6. Check the content of the created file:

 Hello, Go ...