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R""(
# 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
# nix shell nixpkgs#hello -c hello --greeting 'Hi everybody!'
Hi everybody!
```
* Run GNU Hello in a chroot store:
```console
# nix shell --store ~/my-nix nixpkgs#hello -c hello
```
* Start a shell providing GNU Hello in a chroot store:
```console
# 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 not command is
specified, it starts the default shell of your user account.
)""
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