# Shell

The Shell is a program on a Unix or Linux based system that accepts commands from the…

## What is the **Shell**?

The **Shell** is a program on a Unix or Linux 
based system that accepts commands 
from the keyboard and sends them to the operating
system. In the old days it was the only **User Interface**
available on a computer.

```bash
rmdir old_folder
```

Level: Novice · [More Operating System terms at this level](https://www.ask-codey.com/glossary/subjects/operating-system/novice)

Updated: September 19, 2026

Source: https://www.ask-codey.com/glossary/shell