Using sed in golang

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16
  1. you don’t need to do filePath := file
  2. you need to check errors
    so, the code should look like this:
func sed(old, new, filePath string) error {
	fileData, err := ioutil.ReadFile(filePath)
    if err != nil {
          return err
    }

	fileString := string(fileData)
	fileString = strings.ReplaceAll(fileString, old, new)
	fileData = []byte(fileString)

	err = ioutil.WriteFile(filePath, fileData, 0o600)
    if err != nil {
            return err
    }
        
    return nil
}