nix shell

Warning: This program is experimental and its interface is subject to change.

# Name

`nix shell` - run a shell in which the specified packages are available

# Synopsis

`nix shell` [option...] installables...

# Examples

- Start a shell providing `youtube-dl` from the `nixpkgs` flake:

      # nix shell nixpkgs#youtube-dl
      # youtube-dl --version
      2020.11.01.1

- Start a shell providing GNU Hello from NixOS 20.03:

      # nix shell nixpkgs/nixos-20.03#hello

- Run GNU Hello:

      # nix shell nixpkgs#hello -c hello --greeting 'Hi everybody!'
      Hi everybody!

- Run GNU Hello in a chroot store:

      # nix shell --store ~/my-nix nixpkgs#hello -c hello

- Start a shell providing GNU Hello in a chroot store:

      # nix shell --store ~/my-nix nixpkgs#hello nixpkgs#bashInteractive -c bash

  Note that it's necessary to specify `bash` explicitly because your default shell (e.g. `/bin/bash`) generally will not exist in the chroot.

# Description

`nix shell` runs a command in an environment in which the `$PATH` variable provides the specified installables. If no command is specified, it starts the default shell of your user account specified by `$SHELL`.

# Options

- `--command` / `-c` command args
  Command and arguments to be executed, defaulting to `$SHELL`

- `--ignore-environment` / `-i`
  Clear the entire environment (except those specified with `--keep`).

- `--keep` / `-k` name
  Keep the environment variable name.

- `--unset` / `-u` name
  Unset the environment variable name.

Common evaluation options:

- `--arg` name expr
  Pass the value expr as the argument name to Nix functions.

- `--argstr` name string
  Pass the string string as the argument name to Nix functions.

- `--eval-store` store-url
  The Nix store to use for evaluations.

- `--impure`
  Allow access to mutable paths and repositories.

- `--include` / `-I` path
  Add path to the list of locations used to look up `<...>` file names.

- `--override-flake` original-ref resolved-ref
  Override the flake registries, redirecting original-ref to resolved-ref.

Common flake-related options:

- `--commit-lock-file`
  Commit changes to the flake's lock file.

- `--inputs-from` flake-url
  Use the inputs of the specified flake as registry entries.

- `--no-registries`
  Don't allow lookups in the flake registries. This option is deprecated; use `--no-use-registries`.

- `--no-update-lock-file`
  Do not allow any updates to the flake's lock file.

- `--no-write-lock-file`
  Do not write the flake's newly generated lock file.

- `--override-input` input-path flake-url
  Override a specific flake input (e.g. `dwarffs/nixpkgs`). This implies `--no-write-lock-file`.

- `--recreate-lock-file`
  Recreate the flake's lock file from scratch.

- `--update-input` input-path
  Update a specific flake input (ignoring its previous entry in the lock file).

Options that change the interpretation of installables:

- `--derivation`
  Operate on the store derivation rather than its outputs.

- `--expr` expr
  Interpret installables as attribute paths relative to the Nix expression expr.

- `--file` / `-f` file
  Interpret installables as attribute paths relative to the Nix expression stored in file. If file is the character -, then a Nix expression will be read from standard input.