the-way-to-go_ZH_CN/eBook/examples/chapter_12/filewrite.go

package main

import "os"

func main() {
	os.Stdout.WriteString("hello, world\n")
	f, _ := os.OpenFile("test", os.O_CREATE|os.O_WRONLY, 0)
	defer f.Close()
	f.WriteString("hello, world in a file\n")
}