Opening a file by name

File access is a very common operation used to store or read the data. This recipe illustrates how to open a file by its name and path, using the standard library.

How to do it...

1. Open the console and create the folder chapter05/recipe03.
2. Navigate to the directory.
3. Create the directory temp and create the file file.txt in it.

4. Edit the file.txt file and write This file content into the file.
5. Create the openfile.go file with the following content:

        package main

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

        func main() {

          f, err := os.Open("temp/file.txt")
          if err != nil {
            panic(err)
          }

          c, err := ioutil.ReadAll(f)
          if err != nil {
            panic(err)
          }

          fmt.Printf("### File content ###\n%s\n", string(c))
          f.Close()

          f, err = os.OpenFile("temp/test.txt", os.O_CREATE|os.O_RDWR,
                               os...