Exec command line commands in go

exec.go

package main

import (
	"fmt"
	"log"
	"os/exec"
	"strings"
)

func main() {
  //commands 
	cmdProg := "ls"
	cmdArgs := [...]string{"-a", "l"}

	cmdArgsString := strings.Join(cmdArgs[:], "")
	cmd := cmdProg + " " + cmdArgsString

	//is cmdProg installed?
	path, err := exec.LookPath(cmdProg)
	if err != nil {
		log.Fatal("You need to install " + cmdProg + " before :)")
	} else {
		fmt.Println(cmdProg + " found at: " + path + "\n ---- START ----")
	}

	//exec command
	out, err := exec.Command(cmdProg, cmdArgsString).CombinedOutput()
	if err != nil {
		log.Fatal(err)
	}
	fmt.Println("Executing ("+cmd+"): \n ", string(out))

}