if we want to use go like python and executed without gorun

make go executible

```
echo ':golang:E::go::/usr/local/bin/gorun:OC' | sudo tee /proc/sys/fs/binfmt_misc/register
:golang:E::go::/usr/local/bin/gorun:OC
```

```
package main

import (
	"fmt"
	"os"
)

func main() {
	s := "world"

	if len(os.Args) > 1 {
		s = os.Args[1]
	}

	fmt.Printf("Hello, %v!", s)
	fmt.Println("")

	if s == "fail" {
		os.Exit(30)
	}
}
```

```
chmod u+x hello.go
```

https://www.kernel.org/doc/html/v4.14/admin-guide/binfmt-misc.html