nixos cheat sheet / published by https://github.com/dacr/code-examples-manager #9e9f9a93-ca32-46a9-bad3-6f6d2977ca8f/6e3a40989446c92a1fd394cd8906dc1d62259468

nixos.md

nixos cheat sheet

Notes

• https://nixos.wiki/index.php?title=Cheatsheet&useskin=vector

Installing NIXOS

make ISO image

lsblk
sudo dd of=/dev/sdh if=~/Downloads/nixos-gnome-21.11.337514.4c560cc7ee5-x86_64-linux.iso
sudo dd of=/dev/sdc1 if=nixos-gnome-22.05.2676.b9fd420fa53-x86_64-linux.iso

Operating NIXOS

• sudo vi /etc/nixos/configuration.nix
• sudo nixos-rebuild switch
• encoding users password in configuration.nix
  1. mkpasswd -m sha-512
  2. And in configuration.nix : hashedPassword="..."
  3. OF course this is not a best practice ;)

Search for packages

• by regex :

  nix-env -qa 'i3.*'
  nix-env -qa '.*idea.*'
  

• by package name : nix search xfce (experimental)
• by command name : command-not-found make
• which package : nix-locate /bin/sh

Updates

sudo nix-channel --update
sudo nixos-rebuild switch

Upgrades

sudo nix-channel --list
sudo nix-channel --add https://nixos.org/channels/nixos-22.05 nixos
sudo nix-channel --add https://nixos.org/channels/nixos-22.11 nixos
sudo nix-channel --add https://nixos.org/channels/nixos-23.11 nixos

Cleanup

nix-collect-garbage
nix-collect-garbage -d

Cleanup boot

For example when build fail because no more space in /boot/ file system

nix-env --list-generations --profile /nix/var/nix/profiles/system

nix-env --delete-generations --profile /nix/var/nix/profiles/system --delete-generations +5
nix-env --delete-generations --profile /nix/var/nix/profiles/system 199 198 197

Unstable channel

sudo nix-channel --add https://nixos.org/channels/nixos-unstable nixpkgs-unstable

And to make it available in /etc/nixos/configuration.nix as for example unstable.jetbrains.idea-ultimate :

{ config, pkgs, ... }:

let
  unstable = import <nixpkgs-unstable> {
    config.allowUnfree = true;
  };
in
{{ config, pkgs, ... }:

let
  unstable = import <nixpkgs-unstable> {
    config.allowUnfree = true;
  };
in
{
...
}

Temporary install :)

• ephemeral install : nix-shell -p nmap
  • just for the started shell session life time !!!!! :)