Demo for Nix as Shebang

hello.py

#!/usr/bin/env nix-shell
#! nix-shell -p 'python3.withPackages (ps: with ps; [ msgspec ])' -i python3

import msgspec
print('hello')

hello.sh

#!/usr/bin/env nix
#! nix shell nixpkgs#bash --command bash -e

#Doc: https://nix.dev/manual/nix/2.22/command-ref/new-cli/nix3-shell#use-as-a--interpreter

echo Hello, $NAME
echo $@

# Usage:
# $ NAME=Nix ./hello.sh today is a good day!
# Hello, Nix
# today is a good day!