Update cheatsheets

nix

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# nix
+
+> A powerful package manager that makes package management reliable, reproducible, and declarative.
+> `nix` is experimental and requires enabling experimental features. For a classic, stable interface, see `tldr nix classic`.
+> Some subcommands such as `build`, `develop`, `flake`, `registry`, `profile`, `search`, `repl`, `store`, `edit`, `why-depends`, etc. have their own usage documentation.
+> More information: <https://nixos.org/manual/nix>.
+
+- Enable the `nix` command:
+
+`mkdir -p ~/.config/nix; echo 'experimental-features = nix-command flakes' > ~/.config/nix/nix.conf`
+
+- Search for a package in nixpkgs via its name or description:
+
+`nix search nixpkgs {{search_term}}`
+
+- Start a shell with the specified packages from nixpkgs available:
+
+`nix shell {{nixpkgs#pkg1 nixpkgs#pkg2 nixpkgs#pkg3 ...}}`
+
+- Install some packages from nixpkgs permanently:
+
+`nix profile install {{nixpkgs#pkg1 nixpkgs#pkg2 nixpkgs#pkg3 ...}}`
+
+- Remove unused paths from Nix store to free up space:
+
+`nix store gc`
+
+- Start an interactive environment for evaluating Nix expressions:
+
+`nix repl`
+
+- Display help for a specific subcommand:
+
+`nix help {{subcommand}}`