Golang : Read a text file and replace certain words

Problem :

You have a text file with some words that you need to replace with another word.

Solution :

Use the bytes.Replace() function. For example :

 package main

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

 func main() {

 input, err := ioutil.ReadFile("original.txt")
 if err != nil {
 fmt.Println(err)
 os.Exit(1)
 }

 output := bytes.Replace(input, []byte("replaceme"), []byte("ok"), -1)

 if err = ioutil.WriteFile("modified.txt", output, 0666); err != nil {
 fmt.Println(err)
 os.Exit(1)
 }
 }

original.txt

 this is a text file that contains couple of replaceme words that need to be replaced.
 for example, a replaceme word in this line


 and another [replaceme] word in this line too

and after executing the above code

modified.txt

 this is a text file that contains couple of ok words that need to be replaced.
 for example, a ok word in this line


 and another [ok] word in this line too