Run Go program as script

script.go

//usr/bin/env go run $0 "$@"; exit
package main

import (
	"fmt"
	"os"
)

func main() {
	fmt.Println("Hello world!")
	cwd, _ := os.Getwd()
	fmt.Println("cwd:", cwd)
	fmt.Println("args:", os.Args[1:])
}

Why this works: http://www.faqs.org/faqs/unix-faq/faq/part3/section-16.html

tl;dr: magic number not detected (e.g. shebang #!), so falls back to treating like a script and running it with /bin/sh. The first line coincidentally is a call to env and a comment in Golang, so this happens to work. It calls go run with the same file path, and exits at the end of that first invocation. Go ignores the exit because it's in the comment, and runs the Go code instead.

Nifty!