Golang操作命令行的几种方式总结

func main() {
        // # grep 321 2022053015.log
	command := exec.Command("grep", "321", "2022053015.log")
	out := bytes.NewBuffer(nil)
	command.Stdout = out
	command.Stderr = os.Stderr
	if err := command.Run(); err != nil {
		log.Fatal(err)
	}
	fmt.Println(out.String())
}

func main() {
	// # grep 321 20220530*.log
	command := exec.Command("grep", "321", "20220530*.log")
	out := bytes.NewBuffer(nil)
	command.Stdout = out
	command.Stderr = os.Stderr
	if err := command.Run(); err != nil {
		log.Fatal(err)
	}
	fmt.Println(out.String()) 
}

func main() {
        // 进入Shell上下文
	command := exec.Command("sh")
	in := bytes.NewBuffer(nil)
	out := bytes.NewBuffer(nil)
	command.Stdin = in
	command.Stdout = out
	command.Stderr = os.Stderr
        // 输入命令，记得每个命令最后以换行符结束，这样Shell才会执行这个命令
	grepCmd := fmt.Sprintf("grep %s %s*.log\n", "321", "20220530")
	in.WriteString(grepCmd)
        // 完成之后退出Shell上下文
	in.WriteString("exit\n")
	if err := command.Run(); err != nil {
		log.Fatal(err)
	}
	fmt.Println(out.String())
}

// 执行shell命令
func Exec(cmd string) (*bytes.Buffer, error) {
	command := exec.Command("sh")
	in := bytes.NewBuffer(nil)
	out := bytes.NewBuffer(nil)
	command.Stdin = in
	command.Stdout = out
	command.Stderr = os.Stderr
	in.WriteString(cmd)
	in.WriteString("exit\n")
	return out, command.Run()
}
func main() {
	grepCmd := fmt.Sprintf("grep %s %s*.log\n", "321", "20220530")
	out, err := Exec(grepCmd)
	if err != nil {
		log.Fatal(err)
	}
	fmt.Println(out.String())
}