lix/src/nix/shell.md

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# Examples
* Start a shell providing `youtube-dl` from the `nixpkgs` flake:
```console
# nix shell nixpkgs#youtube-dl
# youtube-dl --version
2020.11.01.1
```
* Start a shell providing GNU Hello from NixOS 20.03:
```console
# nix shell nixpkgs/nixos-20.03#hello
```
* Run GNU Hello:
```console
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# nix shell nixpkgs#hello --command hello --greeting 'Hi everybody!'
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Hi everybody!
```
* Run multiple commands in a shell environment:
```console
# nix shell nixpkgs#gnumake --command sh -c "cd src && make"
```
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* Run GNU Hello in a chroot store:
```console
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# nix shell --store ~/my-nix nixpkgs#hello --command hello
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```
* Start a shell providing GNU Hello in a chroot store:
```console
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# nix shell --store ~/my-nix nixpkgs#hello nixpkgs#bashInteractive --command bash
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```
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 `$PATH` variable
provides the specified [*installables*](./nix.md#installable). If no command is specified, it starts the
default shell of your user account specified by `$SHELL`.
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