nushell/docs/commands/extern.md

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---
title: extern
layout: command
version: 0.59.0
---
Define a signature for an external command
## Signature
```> extern (def_name) (params)```
## Parameters
- `def_name`: definition name
- `params`: parameters
## Examples
Write a signature for an external command
```shell
> extern echo [text: string]
```