---
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title: Fun - os_env.fun — overview
subtitle: Documentation for os_env.fun — overview
description: Documentation for os_env.fun — overview
permalink: /documentation/examples/os_env/
lang: en
tags:
- documentation
- handbook
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- usage
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---

# os_env.fun — overview

What it shows
- Reading and writing environment variables from the operating system.

How to run
- export FUN_LIB_DIR="./lib"
- ./build_debug/fun examples/os_env.fun
- Or: fun examples/os_env.fun