Execute a shell command from a Golang program

goexec.go

package main

import (
	"fmt"
	"os/exec"
)

func main() {
	app := "echo"
	arg0 := "-e"
	arg1 := "Hello world"
	arg2 := "\n\tfrom"
	arg3 := "golang"

	cmd := exec.Command(app, arg0, arg1, arg2, arg3)
	stdout, err := cmd.Output()
	if err != nil {
		fmt.Println(err.Error())
		return
	}

	fmt.Println(string(stdout))
}