CLI Reference

NixOS Configuration Management

nixos-rebuild

sudo nixos-rebuild switch --flake /etc/nixos     # Apply current config
sudo nixos-rebuild switch --flake /etc/nixos#nixos  # Specific config
sudo nixos-rebuild dry-activate --flake /etc/nixos  # Preview changes

nix flake update

Updates flake inputs to their latest commits:

nix flake update              # Update all inputs
nix flake update nixpkgs      # Update only nixpkgs
nix flake metadata            # Show current input versions

nix-version

Interactively look up package versions from nixpkgs using fzf.

nix-version midea            # Search "midea", pick from results
nix-version                  # Browse all packages with versions
nix-version -p hello         # Direct query: show hello version
nix-version -p python3.pip   # Nested attrpath

# Query your own flake instead of nixpkgs:
NIX_VERSION_FLAKE=. nix-version -p home-assistant-custom-components.midea_ac_lan

Command	What it does
nix-version	Interactive fzf browse (all packages)
nix-version <term>	Search packages matching <term>
nix-version -p <attrpath>	Direct version lookup, no interaction