Simple tool to copy N files into different direcoty

randomfiles.go

package main

import (
  "path"
  "path/filepath"
  "os"
  "time"
  "strconv"
  "math/rand"
)

var Files []string

func shuffle(arr []string) {
  t := time.Now()
  rand.Seed(int64(t.Nanosecond()))

  for i := len(arr) - 1; i > 0; i-- {
    j := rand.Intn(i)
    arr[i], arr[j] = arr[j], arr[i]
  }
}

func visit(path string, f os.FileInfo, err error) error {
  fi, _ := os.Stat(path)
  if err != nil {
    panic(err)
  }
  if !fi.IsDir() {
    Files = append(Files, path)
  }
  return nil
}

func main() {
  root, _ := os.Getwd()
  filepath.Walk(root, visit)
  resultPath := filepath.Join(root, "..",  "r" + strconv.Itoa(int(time.Now().Unix())))
  os.Mkdir(resultPath, 0777)
  shuffledFiles := Files
  shuffle(shuffledFiles)
  
  i := 0
  for _,file := range shuffledFiles {
    if i == 3 {
      return
    }
    os.Rename(file, filepath.Join(resultPath, path.Base(file)))
    i++
  }
}