Nix (Systems configuration language)

To write “Hello World!” in Nix, you would typically create a simple Nix expression. Here’s an example:

{ pkgs ? import <nixpkgs> {} }:

pkgs.stdenv.mkDerivation {
  name = "hello-world";
  src = ./.;
  buildInputs = [ ];
  meta = with pkgs.lib; {
    description = "A simple Hello World program";
  };

  # The actual build and installation logic goes here
  buildPhase = ''
    echo "Hello World!" > hello.txt
  '';

  installPhase = ''
    mkdir -p $out/bin
    cp hello.txt $out/bin/hello
  '';
}

In this Nix expression:
– pkgs ? import <nixpkgs> {} imports the Nix packages collection.
– mkDerivation is a function that creates a new package derivation.
– The buildPhase contains the commands to build your program, in this case, simply writing “Hello World!” to a text file named hello.txt.
– The installPhase specifies where and how to install the output of the build phase.

You can save this expression as a .nix file (e.g., hello.nix) and then build it using the Nix build system:

nix-build hello.nix

This will create an output directory containing your “Hello World!” program.

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