systemcmds02.go

package main
import (
	"bytes"
	"fmt"
	"log"
	"os/exec"
	"strings"
)

func main() {
	 cmd := exec.Command("tr", "a-z", "A-Z")
	 cmd.Stdin = strings.NewReader("hit the hyperdrive chewy")

	 var out bytes.Buffer
	 cmd.Stdout = &out

	 err := cmd.Run()

	 if err != nil {
     	   log.Fatal(err)
   	}

	fmt.Printf("translated phrase: %q\n", out.String())
}