file.go

package main

import (
  "bufio"
  "fmt"
  "log"
  "os"
)

func readLines(path string) ([]string, error) {
  file, err := os.Open(path)
  if err != nil {
    return nil, err
  }
  defer file.Close()

  var lines []string
  scanner := bufio.NewScanner(file)
  for scanner.Scan() {
    lines = append(lines, scanner.Text())
  }
  return lines, scanner.Err()
}


func main() {
  lines, err := readLines("file.go")
  if err != nil {
    log.Fatalf("readLines: %s", err)
  }
  for i, line := range lines {
    fmt.Println(i+1, line)
  }

}