nushell/docs/commands/def.md

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---
title: def
layout: command
version: 0.59.1
---
Define a custom command
## Signature
```> def (def_name) (params) (block)```
## Parameters
- `def_name`: definition name
- `params`: parameters
- `block`: body of the definition
## Examples
Define a command and run it
```shell
> def say-hi [] { echo 'hi' }; say-hi
```
Define a command and run it with parameter(s)
```shell
> def say-sth [sth: string] { echo $sth }; say-sth hi
```