Read files

xor.go

package main

import (
	"fmt"
	"os"
	"sync"
)

var m = make(map[string]int)
var wg sync.WaitGroup

func countWords(fileName string) {
	f, _ := os.Open(fileName)
	defer f.Close()
	defer wg.Done()
	s := ""
	for n, e := fmt.Fscan(f, &s); n > 0 && e == nil; n, e = fmt.Fscan(f, &s) {
		m[s] += 1
	}
}

func main() {
	files := []string{"text.txt", "/etc/passwd", "test.txt"}
	wg.Add(len(files))
	for _, v := range files {
		countWords(v)
	}
	wg.Wait()
	fmt.Println(m)

}