Comparing two files

This recipe gives you a hint on how to compare two files. The recipe will show you how to quickly determine whether the files are identical. The recipe will also present you with a way to find differences between the two.

How to do it...

1. Open the console and create the folder chapter06/recipe09.
2. Navigate to the directory.
3. Create the comparison.go file with the following content:

        package main

        import (
          "bufio"
          "crypto/md5"
          "fmt"
          "io"
          "os"
        )

        var data = []struct {
          name string
          cont string
          perm os.FileMode
        }{
          {"test1.file", "Hello\nGolang is great", 0666},
          {"test2.file", "Hello\nGolang is great", 0666},
          {"test3.file", "Not matching\nGolang is great\nLast line",
           0666},
        }

        func main() {

          files := []*os.File{}
          for _, fData := range data {
            f, err := os.Create(fData.name)
   ...