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package main

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

func check(e error) {
	if e != nil {
		panic(e)
	}
}
func main() {
	d1 := []byte("hello\ngo\n")
	err := ioutil.WriteFile("/tmp/dat1", d1, 0644)
	check(err)
	f, err := os.Create("/tmp/dat2")
	check(err)
	defer f.Close()

	d2 := []byte{115, 111, 109, 101, 10}
	n2, err := f.Write(d2)
	check(err)
	fmt.Printf("wrote %d bytes\n", n2)

	n3, err := f.WriteString("writes\n")
	fmt.Printf("wrote %d bytes\n", n3)
	f.Sync()
	w := bufio.NewWriter(f)

	n4, err := w.WriteString("buffered\n")
	fmt.Printf("wrote %d bytes\n", n4)
	w.Flush()
}
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$ go run writing-files.go 
wrote 5 bytes
wrote 7 bytes
wrote 9 bytes

$ cat /tmp/dat1
hello
go
$ cat /tmp/dat2
some
writes
buffered
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