In Nix, you would typically define a configuration or expression using Nix’s syntax. However, Nix is primarily used for defining system and package configurations rather than writing traditional programs like printing “Hello World!”. Here’s an example of how you might use Nix to create a simple configuration that prints “Hello World!” using a shell script:
{ pkgs ? import <nixpkgs> {} }:
pkgs.stdenv.mkDerivation {
name = "hello-world";
buildInputs = [ pkgs.coreutils ];
phases = [ "build" "installPhase" ];
buildPhase = ''
echo 'echo "Hello World!"' > hello.sh
chmod +x hello.sh
'';
installPhase = ''
mkdir -p $out/bin
mv hello.sh $out/bin/
'';
}
This Nix expression defines a simple derivation that generates a shell script named hello.sh and installs it in the bin/ directory. When you run this, you can then execute the script to see “Hello World!” printed.
If you want to directly execute something like “Hello World!” as part of your configuration, you might need to integrate this into a larger NixOS system configuration or use it in a shell script that is managed by another mechanism.
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