Let's clone all of them. You cannot clone them inside `playground/`, because you knowledge-bases cannot be nested. Please make sure to `cd ..;` before you clone them.

Run `cd ..; rag clone http://ragit.baehyunsol.com/sample/git; rag clone http://ragit.baehyunsol.com/sample/ragit; rag clone http://ragit.baehyunsol.com/sample/rustc;`

```
<cwd>
  |
  *-- playground
  |   |
  |   *-- .ragit/
  |       |
  |       *-- .. many files and directories
  |
  *-- git
  |   |
  |   *-- .ragit/
  |       |
  |       *-- .. many files and directories
  |
  *-- ragit
  |   |
  |   *-- .ragit/
  |       |
  |       *-- .. many files and directories
  |
  *-- rustc
      |
      *-- .ragit/
          |
          *-- .. many files and directories
```

Now we have 1 empty knowledge-base and 3 complete knowledge-bases. We're gonna use the empty knowledge-base as the main one. Let's extend the empty one (playground).

Run `cd playground`. `rag merge ../git --prefix=git`, `rag merge ../ragit --prefix=ragit` and `rag merge ../rustc --prefix=rustc`.

## 3. Change Configs

Before asking a question or building a knowledge-base, you may want to change configurations. Configurations are very important because most commands cost money and you can optimize it with proper configurations.

### Per Knowledge-Base Configuration

Run `rag config --get model`. You'll see which model is used to answer your queries and build a knowledge-base.

Let's say you have free credits for Anthropic. By running `rag config --set model claude-3.5-sonnet`, you can change your default model.

Run `rag config --get-all` to see all the keys and values.

### Global Configuration

If you want to set default configurations for all your repositories, you can create configuration files in `~/.config/ragit/`:

- `~/.config/ragit/api.json` - For API configuration (model, timeout, etc.)
- `~/.config/ragit/build.json` - For build configuration (chunk size, etc.)
- `~/.config/ragit/query.json` - For query configuration (max titles, etc.)

These files can contain just the specific fields you want to override - you don't need to include all configuration options. For example, if you only want to set a default model, your `~/.config/ragit/api.json` could be as simple as:

```json
{
  "model": "claude-3.5-sonnet"
}
```

When you run `rag init` to create a new repository, these global configurations will be used as defaults. This is especially useful if you always want to use a specific model or have specific build parameters.

## 4. Build an inverted-index

[Inverted-index](https://en.wikipedia.org/wiki/Inverted_index) is a special kind of data structure that makes full-text searching much faster. By running `rag ii-build`, you can build an inverted index. Once you're done, run `rag ii-status` and see if it says "complete". If so, you're good to go. Text retrieval will get much faster.

## 5. Ask questions on a Knowledge-Base

Asking query is straight forward: `rag query "Tell me how the rust compiler uses git"`

If you want an interactive chat, run `rag query --interactive`.