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R""(
# Examples
* Display all special commands within the REPL:
```console
# nix repl
nix-repl> :?
```
* Evaluate some simple Nix expressions:
```console
# nix repl
nix-repl> 1 + 2
3
nix-repl> map (x: x * 2) [1 2 3]
[ 2 4 6 ]
```
* Interact with Nixpkgs in the REPL:
```console
# nix repl '<nixpkgs>'
Loading '<nixpkgs>'...
Added 12428 variables.
nix-repl> emacs.name
"emacs-27.1"
nix-repl> emacs.drvPath
"/nix/store/lp0sjrhgg03y2n0l10n70rg0k7hhyz0l-emacs-27.1.drv"
nix-repl> drv = runCommand "hello" { buildInputs = [ hello ]; } "hello > $out"
nix-repl> :b x
this derivation produced the following outputs:
out -> /nix/store/0njwbgwmkwls0w5dv9mpc1pq5fj39q0l-hello
nix-repl> builtins.readFile drv
"Hello, world!\n"
```
# Description
This command provides an interactive environment for evaluating Nix
expressions. (REPL stands for 'read–eval–print loop'.)
On startup, it loads the Nix expressions named *files* and adds them
into the lexical scope. You can load addition files using the `:l
<filename>` command, or reload all files using `:r`.
)""
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