// Copyright 2012 The Go Authors. All rights reserved.// Use of this source code is governed by a BSD-style// license that can be found in the LICENSE file. package exec_test import (	"bytes"	"encoding/json"	"fmt"	"log"	"os/exec"	"strings") func ExampleLookPath() {	path, err := exec.LookPath("fortune")	if err != nil {		log.Fatal("installing fortune is in your future")	}	fmt.Printf("fortune is available at %s\n", path)} func ExampleCommand() {	cmd := exec.Command("tr", "a-z", "A-Z")	cmd.Stdin = strings.NewReader("some input")	var out bytes.Buffer	cmd.Stdout = &out	err := cmd.Run()	if err != nil {		log.Fatal(err)	}	fmt.Printf("in all caps: %q\n", out.String())} func ExampleCmd_Output() {	out, err := exec.Command("date").Output()	if err != nil {		log.Fatal(err)	}	fmt.Printf("The date is %s\n", out)} func ExampleCmd_Start() {	cmd := exec.Command("sleep", "5")	err := cmd.Start()	if err != nil {		log.Fatal(err)	}	log.Printf("Waiting for command to finish...")	err = cmd.Wait()	log.Printf("Command finished with error: %v", err)} func ExampleCmd_StdoutPipe() {	cmd := exec.Command("echo", "-n", `{"Name": "Bob", "Age": 32}`)	stdout, err := cmd.StdoutPipe()	if err != nil {		log.Fatal(err)	}	if err := cmd.Start(); err != nil {		log.Fatal(err)	}	var person struct {		Name string		Age  int	}	if err := json.NewDecoder(stdout).Decode(&person); err != nil {		log.Fatal(err)	}	if err := cmd.Wait(); err != nil {		log.Fatal(err)	}	fmt.Printf("%s is %d years old\n", person.Name, person.Age)}