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nushell/docs/commands/def-env.md

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---
title: def-env
layout: command
version: 0.59.0
---
Define a custom command, which participates in the caller environment
## Signature
```> def-env (def_name) (params) (block)```
## Parameters
- `def_name`: definition name
- `params`: parameters
- `block`: body of the definition
## Examples
Set environment variable by call a custom command
```shell
> def-env foo [] { let-env BAR = "BAZ" }; foo; $env.BAR
```