SYNOPSIS
       env [-i] [name=value]... [utility [argument...]]

Oh no, -S might be a GNU extension…

not quite, macOS also has -S:

 -S string
         Split apart the given string into multiple strings, and process each of the resulting strings as separate
         arguments to the env utility.  The -S option recognizes some special character escape sequences and also
         supports environment-variable substitution, as described below.

and it also says this, so FreeBSD at least should have it too

The -P, -S and -v options were added in FreeBSD 6.0.

In reply to @weethet:catgirl.cloud
Once flakes are removed from the main tree, there still would be a nix-repl

configuration.nix - Main system configuration

============================================================================

{pkgs, ...}: {
imports = [
# Hardware
./hardware-configuration.nix
./hardware.nix

# System modules
./system/boot.nix
./system/locale.nix
./system/network.nix

# Services
./services.nix

# User configuration
./users.nix

# Applications and packages
./apps.nix

# Virtualization
./virtualization/kvm.nix
./virtualization/docker.nix

# Security & Pentesting
./athena.nix

# Customization
./customisation.nix
./llm.nix

];

system.stateVersion = "24.11";
nixpkgs.overlays = [
(final: prev: {
inherit
(prev.lixPackageSets.stable)
nixpkgs-review
nix-eval-jobs
nix-fast-build
colmena
;
})
];

nix.package = pkgs.lixPackageSets.stable.lix;

nixpkgs.config = {
allowUnfree = true;
segger-jlink.acceptLicense = true;
};

nix.settings.experimental-features = ["nix-command" "flakes"];
}

============================================================================

I installed lix but im not sure it do anything