gistfile1.go

package main

import (
  "io/ioutil"
  "os"
  "sort"
  "strings"
)

func main() {
  content, _ := ioutil.ReadFile(os.Args[1])
  lines := strings.Split(string(content), "\n")

  sort.Strings(lines)

  ioutil.WriteFile(os.Args[2], []byte(strings.Join(lines, "\n")), 0600)
}