bufio

bufio

package main

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

func main() {
  file, err := os.Create("file.txt")
  if err != nil {
    panic(err)
  }

  writer := bufio.NewWriter(file)
  for i := 0; i < 10; i++ {
    writer.WriteString(fmt.Sprintf("This is line %d\n", i+1))
  }
  writer.Flush()
  fmt.Println("Done")
  defer file.Close()

  f2, err := os.Open("file.txt")
  if err != nil {
    panic(err)
  }
  defer f2.Close()

  reader := bufio.NewReader(f2)
  for {
    line, err := reader.ReadString('\n')
    if err == io.EOF {
      break
    }
    if err != nil {
      panic(err)
    }
    fmt.Println(line)
  }
}