Hello, Deno!

main.ts

import { parse } from "https://deno.land/std/flags/mod.ts";

function greet(name?: string): void {
  if (!name) {
    console.log('Hello, World!');
  } else {
    console.log(`Hello, ${name}!`);
  }
}

const { name } = parse(Deno.args);

greet(name);

You can use the deno install command to save the file as an executable:

$ deno install hello-deno https://gist.githubusercontent.com/thgaskell/20d209a5da49be7a01933ec86d7ae908/raw/main.ts
Download https://gist.githubusercontent.com/thgaskell/20d209a5da49be7a01933ec86d7ae908/raw/main.ts
Compile https://gist.githubusercontent.com/thgaskell/20d209a5da49be7a01933ec86d7ae908/raw/main.ts
Download https://deno.land/std/flags/mod.ts
Download https://deno.land/std/testing/asserts.ts
Download https://deno.land/std/fmt/colors.ts
Download https://deno.land/std/testing/diff.ts
Download https://deno.land/std/testing/format.ts
✅ Successfully installed hello-deno

After that, you may be prompted to add the deno binary path to your $PATH variable. Once your shell script resolves the deno binary path, you should be able to run the command with your chosen executable name:

$ hello-deno
Hello, World!