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37 lines
1.9 KiB
Markdown
37 lines
1.9 KiB
Markdown
# Usage of the New CLI
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Once you have enabled `nix-command` and `flake`, you can use the `nix help` command to obtain information about the [New Nix Commands][New Nix Commands]. Here are some useful examples:
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```bash
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# The following command installs and runs the `ponysay` package from the `nixpkgs` flake.
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# The `nixpkgs` flake refers to the `nixpkgs` repository on GitHub, which contains a `flake.nix` file.
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# `nixpkgs` is a flake registry ID for `github:NixOS/nixpkgs/nixos-unstable`.
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# You can find all the flake registry IDs at <https://github.com/NixOS/flake-registry/blob/master/flake-registry.json>.
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echo "Hello Nix" | nix run "nixpkgs#ponysay"
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# this command is the same as above, but use a full flake URI instead of falkeregistry id.
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echo "Hello Nix" | nix run "github:NixOS/nixpkgs/nixos-unstable#ponysay"
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# instead of treat flake package as an application,
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# this command use `devShells.example` in flake `zero-to-nix`'s outputs, to setup the development environment,
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# and then open a bash shell in that environment.
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nix develop "github:DeterminateSystems/zero-to-nix#example"
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# instead of using a remote flake, you can open a bash shell using the flake located in the current directory.
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mkdir my-flake && cd my-flake
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# init a flake with template
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nix flake init --template "github:DeterminateSystems/zero-to-nix#javascript-dev"
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# open a bash shell using the flake in current directory
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nix develop
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# or if your flake has multiple devShell outputs, you can specify which one to use.
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nix develop .#example
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# build package `bat` from flake `nixpkgs`, and put a symlink `result` in the current directory.
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mkdir build-nix-package && cd build-nix-package
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nix build "nixpkgs#bat"
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# build a local flake is the same as nix develop, skip it
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```
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We will introduce more details about `nix develop`, `nix shell` and `nix run` in the next chapter.
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[New Nix Commands]: https://nixos.org/manual/nix/stable/command-ref/new-cli/nix.html
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