golang-exercises/golangr/renamer/main.go

package main

import (
	"fmt"
	"os"
)

var src string
var dst string

func main() {
	if len(os.Args) != 3 {
		fmt.Println("Usage: ./renamer oldfile newfile")
		os.Exit(1)
	}
	src = os.Args[1]
	dst = os.Args[2]

	os.Rename(src, dst)

}