file write

Go

func errCheck(e error) {
    if e != nil {
        log.Fatal(e)
    }
}

func main() {
	f, err1 := os.OpenFile(resultFileName, os.O_APPEND|os.O_WRONLY|os.O_CREATE, 0666)
    errCheck(err1)
    
    defer f.Close()
    
    if _, err1 = f.WriteString("text string"); err1 != nil {
		panic(err1)
	}
 }